Johnson Control JRT300-RDHV-S Dual Slope Rotary Laser Level Instruction Manual

Johnson Control JRT300-RDHV-S Dual Slope Rotary Laser Level Instruction Manual

Kit Contents

Safety Instructions

CAUTION

• Class 3R Laser Product
• Max. Power Output: ≤ 5mW
• Wavelength: 630-650nm (Red) 510-530nm & 630-680nm (Green)

THIS TOOL EMITS LASER RADIATION. DO NOT STARE INTO BEAM. AVOID DIRECT EYE EXPOSURE.

ATTENTION

IMPORTANT

• Read all instructions prior to operating this laser tool. Do not remove any labels from tool.
• Do not stare directly at the laser beam.
• Do not project the laser beam directly into the eyes of others.
• Do not set up laser tool at eye level or operate the tool near a reflective surface as the laser beam could be projected into your eyes or into the eyes of others.
• Do not place the laser tool in a manner that may cause someone to unintentionally look into the laser beam. Serious eye injury may result.
• Do not operate the tool in explosive environments, i.e. in the presence of gases or flammable liquids.
• Keep the laser tool out of the reach of children and other untrained persons.
• Do not attempt to view the laser beam through optical tools such as telescopes as serious eye injury may result.
• Always turn the laser tool off when not in use or left unattended for a period of time.

Getting Started

IMPORTANT: It is the responsibility of the user to verify the calibration of the instrument before each use. See section 7.

How to Charge Lithium-ion Batteries

The rotary laser unit is shipped with two Lithium-ion (Li-ion) batteries installed but not charged. Li-ion batteries can be charged either installed or external to the unit. Follow the steps below to charge the batteries.

How to Charge Lithium-ion Batteries Inside the Unit

1. Slide open the battery recharge port on the front of the rotary laser.

Figure 1

2. Connect the Type C, USB adapter/ charger to the rotary laser recharge port.

Figure 2

3. Connect the opposite end of charging cable to a power source and note that a green light next to the charging port lights up. Charge time is typically 5 hours.

4. When charged using this method, the battery charge is indicated by LED light “b”. See Operating Panel Overview.
   Green = ≥30%
   Red = 10% ≤ ≥30%
   Flashing Red = ≤10%

5. Disconnect the Type C, USB adapter/ charger and close the recharge port.

Figure 3

How to Charge Lithium-ion Batteries Outside the Unit

1. Push in and turn the battery lock knob clockwise to the “Unlock” ** position. (Figure 4)
   
   Figure 4**

2. Remove battery compartment from rotary laser. (Figure 5)

Figure 5

3. Remove each battery case from the battery compartment

4. Check the fuel gauge status of the Li-ion battery. Press the micro switch on the battery. Note which LEDs light up. See the table below to determine the power status of the battery. The LEDs will turn off after three seconds. (Figure 6)
   
   Figure 6
   ** Fuel Gauge| LED1| LED2| LED3**
   ---|---|---|---
   Volt of battery < 3.5V| ON| OFF| OFF
   3.5V £ Volt of battery <3.8V| ON| ON| OFF
   3.8V £ Volt of battery| ON| ON| ON

5. Connect the Type C, USB adapter/ charger to battery charging port located on the front of the battery. (Figure 7)
   
   Figure 7

6. Connect the opposite end of charging cable to a power source and note that battery charging LEDs light up. When all three are lit, the battery is fully charged. Charge time is typically 5 hours. See the table below to determine the charging status of the battery.
   Fuel Gauge| LED1| LED2| LED3
   ---|---|---|---
   Volt of battery < 3.6V| Flashing| OFF| OFF
   3.6V £ Volt of battery <3.9V| ON| Flashing| OFF
   3.9V £ Volt of battery| ON| ON| Flashing
   4.165V £ Volt of battery <4.235 (fully charged)| ON| ON| ON

7. Reinsert the battery cases into the battery compartment. Be sure the end with the openings is aligned with the opening on the rear of the battery compartment. (Figure 8)
   
   Figure 8

8. Reinsert the battery compartment into the rotary laser. (Figure 9)
   
   Figure 9

9. Push in and turn the battery lock knob counterclockwise to the ** “Lock” position to lock the battery cover. (Figure 10)
   
   Figure 10**

How to Install or Replace Alkaline Batteries

NOTE: Always check that the battery compartment lock knob is in the “Unlock” position before removing and/or replacing batteries.

1. Push in and turn the battery lock knob clockwise to the “Unlock” ** position. (Figure 11)
   Figure 11**

2. Remove battery compartment from rotary laser. (Figure 12)

Figure 12

3. Remove each battery case from the battery compartment.
4. Slide the covers off the battery cases and insert three “AA” alkaline batteries into each case according to the polarity illustrated inside. (Figure 13)

Figure 13

5. Reinstall the covers and reinsert the battery cases into the battery compartment. Be sure the end with the openings is aligned with the opening on the rear of the battery compartment. (Figure 14)

Figure 14

6. Reinsert the battery compartment into the rotary laser. (Figure 15)

Figure 15

7. Push in and turn the battery lock knob counterclockwise to the “Lock” ****position to lock the battery cover.
   (Figure 16)

Figure 16

How to Use the Type C, USB Adapter/Charger

If no batteries (Lithium-ion or alkaline) are available, you can connect a Type C, USB adapter/charger power cord or power bank to the rotary laser using the battery recharge port, and connect the opposite end of charging cable to a power source.

Operating Panel Overview

Push Buttons

1. ON/OFF button
2. Rotation Speed Selection button (600rpm-1200rpm-0-100rpm-300rpm)
3. Line Operation and Length Operation button (15°, 30°, 60°, 0°)
4. Shock Warning Indicator button
5. Dual-Axis Slope Operation button
6. Upper/Clockwise Direction button
7. Lower/Counterclockwise Direction button

LED Lights

adjustment deactivated
Red| MORE THAN 5°out of level| |
g| Green| Y axis leveling adjustment activated (Press Dual-Axis Slope Operation button twice)| Y axis adjustments complete| Y axis leveling adjustment deactivated
Red| MORE THAN 5°out of level| |

Warning Labels

JRT300-RDHV-K & JRT300-RDHV-S

JRT300-GNHV-K

Parts/Components

Operation Instructions

MPORTANT: It is the responsibility of the user to verify the calibration of the instrument before each use. See section 7.

Using the Rotary Laser

Horizontal or Vertical Position

The Johnson Rotary Laser can be used in either a horizontal or vertical orientation, depending on your needs.
Horizontal Laser Beam
Position Place the rotary laser in an upright position, either on a stable, flat surface, or mount it to a tripod with a 5/8″-11 threaded screw. (Figure 17)

Figure 17

Vertical Laser Beam Position
Place the rotary laser on the side opposite the control panel, either on a stable, flat surface, or mount it to a tripod with a 5/8″-11 threaded screw. (Figure 18)

Figure 18

Automatic Mode

This feature enables the automatic leveling function of the rotary laser.

IMPORTANT: It is best practice to ensure the Shock Warning feature is engaged when the unit is in Automatic Mode. This will prevent the unit from re-leveling if the unit is bumped, jarred, or in any way moved from its original position while turned on. If the unit’s position does change, verify the unit’s position (for example, height) to the potentially changed conditions. It is best to turn the unit off before you move it

1. Press the button to power on/off the rotary laser. The rotary laser enters automatic leveling mode by default. During leveling, indicator “c” flashes green. After leveling, indicator “c” is steady green. The rotary laser will rotate at 600 rpm.
   Power/Battery LED: Steady green LED indicates power is on and battery power is greater than 30%.
   Steady red LED indicates power is on and battery power is between 30% and 10%.
   Flashing red LED indicates power is on and less than 10%. Charge or change the batteries.
   Extinguished LED indicates power is off or battery has been depleted

2. If the rotary laser is placed out of the working angle (5°), indicator “c” flashes red. At the same time the X LED and/or the Y LED flashes red. These indicate the direction that is out of working angle. Adjust the rotating laser position as directed by the indicator in the corresponding direction until the X and/or Y LED turns off and only the “c” LED flashes. Continue leveling the unit until indicator “c” is steady green.

Rotation Speed Mode

This feature changes the rotating speed of the laser.
Press the button to change the rotating speed from the default 600 rpm to 1200 rpm, 0 rpm, 100 rpm, or 300 rpm. Each time this button is pressed, the rotating speed cycles through the rpm settings.

NOTE:

• When starting the unit, the laser will rotate at 600 rpm.
• A lower speed (0 – 300 rpm) is recommended for indoor use to give the best beam visibility.
• A higher speed (600 – 1200 rpm) is recommended when used with a detector

Point/Line Segment Mode (Scan Mode)

This feature changes the 360° rotating laser to either a line segment laser or a single laser point.

1. To change from a 360° rotating laser to a laser point or line, press the button. This can be done when the rotary laser is working in either Automatic or Manual mode. Each time this button is pressed, the laser will cycle successively from 15°, 30°, 60°, or 0°.
2. In Point/Line Segment mode, press button to adjust the position of the laser line clockwise or press  button to adjust the position of the laser line counterclockwise.
3. Press the button to exit Point/Line Segment Mode.

Shock-Warning Function (Automatic Mode only)

This feature alerts if the unit has changed position while in Automatic mode. This may be the result of something striking the unit, strong winds shifting the unit, or shaking on the ground. It prevents the rotary laser from auto leveling after it changes height, thus preventing vertical height errors.

1. Press button to start the Auto Detect Shock function. The LED next to the button will illuminate green. If the rotary laser is affected by wind, is moved or tilted, the rotary laser will automatically stop rotating, the laser point will flash, and the LED next to the button will flash red.
2. To clear the alarm, ensure the rotary laser is back in position, and press the button. The flashing red LED indicator turns off. The unit will enter the automatic mode again to self-level. Reconfirm the leveling height.
3. Press the button once to start or remove the shockproof function.

Manual Mode Function

This feature allows the rotary laser unit to be placed in an angled position. It can be used with the unit in either Rotation mode or Point/Line Segment mode. When the unit is in Manual mode, accuracy of the device is based on the skill and accuracy of the end user. When used in this mode, specified accuracy is not applicable.

1. Press the button for three seconds to enter Manual mode. The LED “e” will illuminate a steady green. The automatic leveling mode is off, and the rotary laser can be placed at any angle.
2. Press the button for three seconds to exit Manual mode and return to Automatic mode.

Slope Mode Function

This feature allows the rotary laser to adjust the pitch of the laser line. Follow the markings on the housing of your unit, as you are looking at the front of it.

1. Place the rotating laser in a horizontal or vertical position. Press the button for three seconds to enter Manual mode. The LED “e” will illuminate a steady green.

2. To change the X direction (right and left): press the button X LED flashes green. Press the button or button. button to adjust the laser angle right or left respectively. Each adjustment is 1 mm at 30 meters. Hold the button for faster adjustments. When the laser beam reaches the desired position, press the button. The X LED will illuminate steady green, and the Y LED will flash green. Press the button again to finish X direction adjustments. The top two LED lights will illuminate steady green.
   NOTE: If the X-axis tilt is greater than 5°, the X LED light flashes red.

3. To change the Y direction (front and back): press the The X LED flashes green. Press the flashes green. Press the button. button again. press The button or button to adjust the laser angle front or back respectively. Each adjustment is 1 mm at 30 meters. Hold the button for faster adjustments. When the laser beam reaches the desired position, press the button to finish Y direction adjustments. The first and third LED lights will illuminate steady green.
   NOTE: If the Y-axis tilt is greater than 5°, the Y LED light flashes red.

4. To change the both the X and Y directions: press the button. The X LED flashes green. Press the button or button to adjust the laser angle right or left respectively. Press the button again. The Y LED flashes green. Press the button or button to adjust the laser angle front or back respectively. When the laser beam reaches the desired position, press the button to finish adjustments. All three LED lights will illuminate steady green.

Using the Remote

Technical Specifications

Power

2 “AAA” Batteries

Steady red LED indicates power is on and battery power is between 30% and 10% Flashing red LED indicates power is on and less than 10%. Charge or change the batteries.

Extinguished LED indicates power is off.

Operating Panel Overview

Push Buttons

1. Lower/Counterclockwise Direction button
2. Upper/Clockwise Direction button
3. Rotation Speed Selection button (600rpm-1200rpm-0-100rpm-300rpm)
4. Line Operation and Length Operation button (15°, 30°, 60°, 0°)
5. Shock Warning Indicator button
6. Dual-Axis Slope Operation button
7. Battery Compartment

Operation

To install batteries into the remote, open the battery compartment and insert two “AAA” alkaline batteries according to the polarity illustrated inside.

NOTE: Take the batteries out when the unit is not in use for a long time.

Press any button on the remote to turn it on.

The buttons on the remote work the same as the buttons on the rotary laser.

Maintenance

• Keep the remote clean. If unit becomes dusty, use a clean cloth to gently wipe it clean.
• Avoid knocking the unit over or allowing it to fall to the ground.
• Although the remote is rain resistant, avoid submerging the unit in water or other liquids. If unit comes into contact with water or other liquids, wipe it dry immediately.
• Do not use unit around fire or expose it to fire in any way.

Using the Detector

Technical Specifications

Detecting accuracy: Fine accuracy: ±1/16″
Coarse accuracy: ±1/4″
Turn-off timer: 10 min ±1 min
Power: 2 “AAA” Batteries
Battery life: 45 hours of continuous use
Sound function: Short sound and solid sound

Operating Panel Overview

1. Front Signal Indicator Window

2. ON/OFF Button

3. Fine/Coarse Detection Button

4. Detecting Window

5. Reference Marker

6. Volume

7. Clamp Bracket Slots

8. Magnet

9. Battery Compartment

10. Magnet

11. Rear Signal Indicator Window

JLR100-RT-RD shown

Display
This is a two-sided laser detector so it can be read from either side of the unit.

1. LOW BATTERY INDICATOR – Indicates when batteries need to be replaced.
2. ACCURACY – Indicates coarse or fine accuracy. Coarse accuracy is ±1/4″, and fine accuracy is ±1/16″.
3. AUDIO – Indicates sound is enabled and indicates volume.
4. BEAM LOCATION INDICATOR – Indicates the direction to move the detector to find the laser beam. If no laser beam is detected in the detection window, this display will be blank.

Operation

To install batteries into the detector, open the battery compartment and insert two “AAA” alkaline batteries according to the polarity illustrated inside. (Figure 19)

Figure 19

NOTE: Take the batteries out when the unit is not in use for a long time.

Detecting Methods

1. Press the button. It will beep once and the display will turn on to indicate the detector is ON. Press and hold the button for 2-3 seconds to turn the detector off.
2. A second short press of the button will toggle the display’s backlighting ON or OFF, respectively.
3. While detecting, the signal indicators show as follows:
   • If the laser beam is below center, the display shows a downward arrow and beeps rapidly.
   • If the laser beam is at center, the display shows a horizontal line and emits a solid sound.
   • If the laser beam is above center, the display shows an upward arrow and beeps slowly.
   • If no laser beam is detected, the detector will remain silent.
4. Keep the detecting window facing the rotating laser.
5. Keep the detector still while detecting the laser beam.
6. When the laser beam is centered, mark at the side reference marker.
   (Figure 20)

Figure 20

7. When the detector does not receive a laser signal for ten minutes, and there are no buttons pushed during these ten minutes, the detector powers off automatically.

Connecting to the Clamp

Slide the clamp bracket into the support bracket on the back side of the unit. (Figure 21)

Figure 21

Volume Control

There are three volume levels on the detector: Off – Medium – High.
Press the Volume button to cycle through the volume levels.

Detection Accuracy

There are two detection accuracy levels: Fine and Coarse. Coarse accuracy is ±1/4″, and fine accuracy is ±1/16″. Press the Fine/Coarse Detection Button to switch between the levels.

Maintenance

• Keep the detector, particularly the detecting window, clean. If unit becomes dusty, use a clean cloth to gently wipe it clean.
• Avoid knocking the unit over or allowing it to fall to the ground.
• Although the detector is rain resistant, avoid submerging the unit in water or other liquids. If unit comes into contact with water or other liquids, wipe it dry immediately.
• Do not use unit around fire or expose it to fire in any way.

Using the Target

The target is used to enhance the laser beam visibility. The target uses magnets for easy mounting to ferrous surfaces in either horizontal or vertical positions. It has measurements in both English and Metric scales (inches/cm). Targets are available for both red and green laser levels. (Figure 22)

Figure 22

Using the Clamp (not included with JRT300-GNHV-K)
The clamp secures the detector to a grade rod.

1. To mount the clamp to a grade rod, press the clamp release button and pull the clamp knob out. (Figure 23)

Figure 23

2. Place a grade rod into the opening on the back of the clamp. (Figure 24)

Figure 23

3. Press and hold the clamp release button to close the clamp knob onto the grade rod. Turn the clamp knob to further tighten the clamp until secure.
   (Figure 25)

Figure 25

4. Slide the detector onto the support bracket until it snaps into place. Refer to “Connecting to the Clamp” on page 24.
5. Use the Fine-tune Height Knob to adjust the height of the detector in small increments from 0″ to 1″.
   (Figure 26)

Figure 26

6. Use the level bullseye to verify the clamp and detector are level to the surface.

Using Track Mount Accessory (included in JRT300-GNHV-K)
The track mount accessory secures the laser to a suspended track or a vertical surface.

To attach the track mount accessory to the unit, press the track mount release and slide the laser mount off the track mount accessory. (Figure 27)

Figure 27

NOTE: There are two ways to mount the track mount accessory to a track: with or without the laser attached. The following pages describe each method.

Method 1: Track Mount Only

1. Insert the laser mount screw into the side 5/8″-11 screw thread of the unit and tighten. (Figure 28)

Figure 28
NOTE: The laser mount is not designed to be used with the bottom 5/8″-11 connection.

2. To attach the track mount accessory to a track, turn the smaller adjustment knob to open the track clamp.
   (Figure 29)

Figure 29

3. Place the track mount accessory onto a track, making sure the clamp is fully seated over the track. Tighten the smaller adjustment knob to secure the track mount accessory to the track.
   (Figure 30)

Figure 30

4.  With laser attached, slide laser mount on to track mount until it clicks into place. (Figure 31)

Figure 31

Method 2: Track Mount and Laser

1. Insert the laser mount screw into the side 5/8″-11 screw thread of the unit and tighten. (Figure 32)

Figure 32
NOTE: The laser mount is not designed to be used with the bottom 5/8″-11 connection.

2. With laser attached, slide laser mount on to track mount until it clicks into place. (Figure 33)

Figure 33

3. To attach the track mount accessory to a track, turn the smaller adjustment knob to open the track clamp.
   (Figure 34)

Figure 34

4. Place the track mount accessory onto a track, making sure the clamp is fully seated over the track. Tighten the smaller adjustment knob to secure the track mount accessory to the track.
   (Figure 35)

Figure 35

5. To adjust the position of the laser, turn the larger height adjustment knob. The measurements on each side of the track mount accessory (inches and cm) determine the distance the laser beam is offset from the track.
   (Figure 36)

Figure 36

6. The track mount accessory can also be hung on a nail using the mounting hole. Turn the knob on the leveling screw to help ensure the position of the unit is level. The leveling screw has a non-mar rubber foot to prevent damage to surfaces.
   (Figure 37)

Figure 37

Accuracy Check

Verify Calibration
NOTE: This test should be done indoors with dim lighting. It is critical that the laser mark is easily seen.

1. Note the X- and Y-direction as indicated on the top of the laser.
   (Figure 38)

Figure 38

2. In an indoor setting, place the laser on a level platform or a tripod 50′ away from a wall. Position the laser so the X-direction is facing the wall.
3. Press the button to turn on the rotary laser.
4. After the unit self-levels, mark any point along the top edge of the beam where the beam hits the wall as Point Ax.
5. Turn the rotary laser unit 180° without moving the tripod.
6. Again, mark a point where the top edge of the beam hits the wall as Point Bx. This point should be in the same vertical plane as point Ax (directly above, below, or on top of point Ax).
7. If the two points do not overlap, mark the center point between points Ax and Bx as Point 0x.
8. f the distance between point Ax and Point Bx is more than 1/32″ at 50′, the laser is out of calibration.
9. Position the rotary laser so the Y-direction is facing the wall.
10. Perform the Y-direction self-check using the same method as the X-direction (steps 4-8 above) and mark Point Ay, By, and 0y.
11. If the distance between points Ay and By is more than 1/32″ at 50′, the laser is out of calibration.
12. If the rotary laser fails step 8 or step 11, contact our Customer Service Department at 888-953-8357.

 Specifications

Red Laser (laser head, plumb dot and plumb down)

| Wave Length (nm)| Laser Class| Power (maw)
---|---|---|---
Laser Head| 630-650nm| 3R| <5mW
Plumb Up Dot| 630-650nm| 3R| <5mW
Plumb Down Dot| 630-680nm| 2| <1mW

Green Laser (green laser head and plumb dot, red plumb down)

| Wave Length (nm)| Laser Class| Power (maw)
---|---|---|---
Laser Head| 510-530nm| 3R| <5mW
Plumb Up Dot| 510-530nm| 3R| <5mW
Plumb Down Dot| 630-680nm| 2| <1mW

Accuracy: ±1/16″ at 100′ horizontal; +1/8″ at 100′ vertical
Interior Range: Up to 200′ (red) or 350′ (green) diameter depending on light conditions (without detector)
Exterior Range: Up to 4000′ diameter with detector (included)
Remote Range: Up to 400′
Self-Leveling Range: ±5°
Power Supply: 2 rechargeable Li-ion batteries or a Type C, USB adapter/charger power supply (included), or 6 “AA” alkaline batteries (not included)
Battery Life: Up to 21 hours Li-ion
Dimensions: 8″ H x 9.5″ W x 7″ D
Working Temperature: 14°F to 113°F
Tripod Thread: 5/8″–11
Rotation Speeds: 0 rpm, 100 rpm, 300 rpm, 600 rpm, or 1200 rpm
IP Protection: IP67

Care and Handling

• This laser unit is a precision tool that must be handled with care.
• Avoid exposing unit to shock vibrations and extreme temperatures.
• Before moving or transporting the unit, make sure that the unit is turned off.
• Remove the batteries when storing the unit for an extended time (more than three months) to avoid damage to the unit should the batteries deteriorate.
• Always store the unit in its case when not in use.
• Avoid getting the unit wet.
• Keep the laser unit dry and clean, especially the laser output window.
• Remove any moisture or dirt with a soft, dry cloth.
• Do not use harsh chemicals, strong detergents or cleaning solvents to clean the laser unit.

Product Warranty & Registration

Johnson Level & Tool offers a five year limited warranty on this product. You can obtain a copy of the limited warranty for a Johnson Level & Tool product by contacting Johnson Level & Tool’s Customer Service Department, as provided below, or by visiting our web site at www.johnsonlevel.com. The limited warranty for each product contains various limitations and exclusions.
Do not return this product to the store/retailer or place of purchase.
Non-warranty repairs and calibration must be done by an authorized Johnson® service center or Johnson Level & Tool’s limited warranty, if applicable, will be void and there will be NO WARRANTY. Contact one of our service centers for all non-warranty repairs. A list of service centers can be found on our web site at www.johnsonlevel.
com or by calling our Customer Service Department. Contact our Customer Service Department for Return Material Authorization (RMA) for warranty repairs (manufacturing defects only). Proof of purchase is required.

For further assistance, or if you experience problems with this product that are not addressed in this instruction manual, please contact our Customer Service Department at 888-953-8357.
Please register within 30 days of purchase. Registering ensures we have your information on file for warranty service even if you lose your receipt, and lets us contact you if there is ever a product recall.
We will never sell your information and only send you marketing information if you opt-in.
To register, go to www.johnsonlevel.com/register.

Accessories

Johnson® accessories and replacement parts are available for purchase through authorized Johnson® dealers. Use of non-Johnson® accessories and replacement parts will void any applicable limited warranty and there will be NO WARRANTY. If you need any assistance in locating any accessories, please contact our Customer Service Department at 888-953-8357.

Trouble Shooting

batteries, or connect to a power source
Laser will not spin| Batteries depleted **** Laser is beyond leveling range| Change or charge the batteries, or connect to a power sourcePlace on surface within 5° of level
Laser is not accurately reading level| Laser is out of calibration MORE THAN 1/16″ at 50′| Perform accuracy check on rotary laser (section 7) or return to Johnson dealer for calibrationReturn to Johnson dealer for service
Laser light appears dim| Batteries are weak **** Improper battery type **** Speed too high (indoor) **** Ambient temperature too high/low| Change or charge the batteries, or connect to a power source Ensure high quality Alkaline batteries are used For indoor operation, operate on lowest speed to produce the most visible beam Ensure temperature is within operating range listed under specifications
Beam is difficult to detect with laser detector| Speed too low| Turn laser RPM to a higher speed

References

• Levels | Laser Levels | Rotary Laser Levels | Construction Measuring Tools | Spirit Level | Builder Levels | Johnson Level & Tool Mfg Company
• Laser Level Registration | Level Registration | Construction Measuring Tool Registration | Johnson Level & Tool Mfg Company

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