APERA PH60Z-HF Smart pH Meter User Manual

PH60Z-HF Smart pH Meter

Specifications:

• Model: PH60Z-HF

• Type: Smart pH Meter

• Designed for: Strong Acidic Solutions and HF-containing
  Solutions

• Features: pH, mV, Temperature measurements

• Certification: ISO 9001: 2015

• Protection Rating: IP67

• Manufacturer: APERA INSTRUMENTS, LLC

• Website: aperainst.com

• Version: V2.1

Product Usage Instructions:

Attention:

• NEVER use the product when it’s freezing cold. Allow it to warm
  to room temperature before use.

• Avoid touching the pH glass membrane with your fingers or other
  materials to prevent static electricity and measurement
  errors.

• Handle the pH electrode with care as the sensor tip is made of
  glass and can break if dropped or bumped against hard objects.

App Setup:

Download the ZenTest App from the Apple App Store or Google Play
Store. Turn on Bluetooth on your phone, open the ZenTest App, tap
on the upper right corner, and select your meter for
connection.

Preparation Before Use:

1. Pull out the battery insulation paper.

2. Loosen the storage vial locking ring and carefully remove the
   electrode.

3. Rinse off the electrode with pure water and blot dry to remove
   excess water.

4. Perform a 2-point calibration before first-time use.

5. For detailed calibration instructions, refer to Section 4.

pH Calibration:

1. Power on the meter and rinse off the electrode in pure
   water.

2. Pour pH buffer solutions into CalPod and dip the electrode into
   pH 7.00 solution first.

3. Enter calibration mode by long-pressing the button. The screen
   will turn green.

4. Wait for the reading to stabilize and finish the first point
   calibration by short pressing.

5. To calibrate the 2nd point, repeat the process with pH 1.68
   solution.

FAQ:

Q: Can I use the pH meter for HF-containing solutions?

A: Yes, the PH60Z-HF Smart pH Meter is designed specifically for
strong acidic solutions and HF-containing solutions. Ensure proper
calibration for accurate results.

Q: How do I clean the pH electrode?

A: Rinse off the electrode with pure water and blot dry with
Kimwipe or clean tissues to remove excess water. Avoid rubbing the
glass membrane to prevent damage.

PH60Z-HF Smart pH Meter for Strong Acidic Solutions and HF-containing Solutions
pH | mV | Temperature
User Manual

ISO 9001: 2015

IP67

APERA INSTRUMENTS, LLC

aperainst.com

V2.1

– 1 –

Table of Contents
1. What’s in the Kit………………………………………………………………………………………… 4 2. Keypad Functions …………………………………………………………………………………….. 4 3. Preparation before Use……………………………………………………………………………… 5 4. pH Calibration ………………………………………………………………………………………….. 7 5. pH Measurement………………………………………………………………………………………. 9 6. Electrode Cleaning……………………………………………………………………………………10 7. Electrode Storage……………………………………………………………………………………..10 8. Parameter Settings …………………………………………………………………………………..10 9. Instrument Technical Specifications ………………………………………………………….12 10. Electrode Technical Specifications …………………………………………………………..12 11. Electrode Replacement ……………………………………………………………………………13 12. Battery Replacement……………………………………………………………………………….14 13. Self Diagnosis Function……………………………………………………………………………15 14. Troubleshooting Guide ……………………………………………………………………………16 15. Appendix ……………………………………………………………………………………………….18 16. Limited Warranty …………………………………………………………………………………….19
Thank you for choosing Apera Instruments. The PH60Z-HF Smart pH Meter with LabSen® 835 pH/temp. electrode is made for professional pH measurement of strong acidic solutions and HF-containing solutions. The recommended pH measurement range of this electrode is pH 0 to 12.
Please read this manual carefully before use in order to get the best result.
ATTENTION
NEVER use the product when it’s freezing cold. Let it warm to room temperature before using.
NEVER use your finger to touch the pH glass membrane or use other materials to rub it. Doing so could generate static electricity and cause measurement errors. To remove extra water on electrode, just shake it off or blot dry with Kimwipe or clean tissues.
Handle the pH electrode with care. The sensor tip is made of glass, and will break if dropped or bumped against hard objects.
– 2 –

How to Connect with ZenTest® Mobile App

Search “zentest” in Apple App Store or Google Play App Store to download the latest App for your meter. Make sure the Bluetooth of your phone is turned on, then

go to ZenTest App, tap

on the upper right corner, then select your meter to

connect (NOT the Demo device).

The content of this user mnual focus on how to operate through the meter’s keypad. For the guides on how to use the ZenTest App to achieve more functions, please refer to the video tutorials by scanning the QR code below.
– 3 –

1. What’s in the Kit
2. Keypad Functions
Short Press — 1 second Long Press — 3 seconds · When turned off, short press to turn on the tester; long press to enter parameter setting. · In calibration mode or parameter setting, short press to return to measurement mode. · In measurement mode, long press to turn off the tester, short press to turn on/off backlight. · In measurement mode, long press to turn on/off Bluetooth® receiver. When it’s turned on, will be flashing; when it’s connected to smartphone, will stay on. · In parameter settings, short press to change parameter (Unidirectional). · Long press to enter calibration mode. · In calibration mode, short press to confirm calibration. · In measurement mode, when Automatic Hold is turned off, short press to manually lock or unlock readings; when Automatic Hold is triggerd, short press to unlock the reading. – 4 –

3. Preparation Before Use
3.1 LabSen 835 Electrode Structure
Connector Locking Ring

8-pin Connector

Storage Vial

Vial Locking Ring

pH Glass Membrane – 5 –

Junction

3.2 Pull out the battery insulation paper. 3.3 Loosen the storage vial locking ring by twisting it counterclockwise. Then pull out
the electrode slowly.
3.4 Let the storage vial (containing soaking solution) stand in the center of the CalPod solution organizer just in case it spills.
3.5 Rinse off the electrode with pure water (preferably distilled or deionized water. RO water is the alternative) , then blot dry the electrode with Kimwipe or clean tissues to remove excess water (Make sure NOT to rub the glass membrane).
3.6 Perform at least a 2-point calibration before first-time use. For calibration details, refer to Section 4. – 6 –

4. pH Calibration

4.1 How to Calibrate
4.1.1 Short press to power on the meter. Remove the storage sleeve and rinse off the electrode in pure water (refer to Section 3.3 to 3.5).
4.1.2 Pour pH buffer solutions into CalPod.Dip the electrode into pH 7.00 solution first, and make a quick stir in the solution, then let it stand.

4.1.3 Long press

to enter calibration

mode, the screen will turn green

(Short press

if you decide to quit

calibration and return to measurement

mode).

4.1.4 Wait for the reading to stabilize (when stays on the screen), then short press
again to finish the first point calibration (pressing too early could lead to Er2 error). “7.00” will be flickering and the meter will return to measurement
mode. Icon (the middle point) will appear at the bottom left, indicating a successful 1-point calibration.

4.1.5 To calibrate the 2nd point, rinse off the electrode with pure water and remove excess water. Dip the electrode into pH 1.68 solution and repeat Step 4.1.3 to
4.1.4. “1.68” will be flickering and (the low point) will show up next to , indicating a successful 2-point calibration.

4.1.6 To calibrate the 3rd point (if estimated sample pH >7), rinse off the electrode with pure water and remove excess water. Dip the electrode into pH 10.01 solution and make a quick stir, then repeat Step 4.1.3 to 4.1.4. “10.01” will be
flickering and (the high point) will display next to and , indicating a successful 3-point calibration.
4.2 Notes about Calibration 4.2.1 Always start calibrating with pH 7.00 first. Perform the 2nd and 3rd point
calibration immediately after the 1st point is finished. Do NOT turn off the meter before you calibrate the second or third point. Otherwise, after you restart the meter and perform calibration in other buffers, Er1 error will be generated and you will have to calibrate with pH 7.00 again. For more troubleshooting tips with calibration, refer to Section 14.

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4.2.2 The pH 1.68 and pH 7.00 buffer solutions poured into the CalPod can be used for up to 10 times as long as they are not contaminated and the CalPod is capped when not in use. pH 12.45 can only be used for up to 5 times as it will lose its
accuracy much faster. After that, replace the buffer solutions in the calibration
vials with new ones to keep the accuracy. Keeping the freshness and cleanliness
of calibration buffers is essential for accurate pH measurement.

4.2.3 Isothermal Measurement Principle — The automatic temperature compensation of pH meters is not sufficient in compensating all pH measurement errors caused by temperature changes. To obtain the most accurate measurement, the meter should be calibrated in the buffer solution at a similar temperature as the sample solution, especially when the sample solution temperature is far away from room temperature.

4.2.4 The tester can perform 1 to 3 points of automatic calibration and can recognize 5 types of pH standard solutions. For details, please refer to the following table:

Calibration USA Standard Series

NIST Standard Series

1-point

7.00 pH

6.86 pH

2-point

Option A

1st pt: 7.00 pH 2nd pt: 4.00 pH
or 1.68 pH

Option A

1st pt: 6.86 pH 2nd pt: 4.01 pH or
1.68 pH

1st pt: 7.00 pH Option B 2nd pt: 10.01 pH
or 12.45 pH

Option B

1st pt: 6.86 pH 2nd pt: 9.18 pH or
12.45 pH

3-point

1st pt: 7.00 pH 2nd pt: 4.00 or 1.68 pH 3rd pt: 10.01 or 12.45 pH

1st pt: 6.86 pH 2nd pt: 4.01 or 1.68 pH 3rd pt: 9.18 pH or 12.45 pH

Icon

Recommended Accuracy requirement
0.1 pH Range < 7.00 pH
Range >7.00 pH
Range: 0 to 14.00 pH

4.3 How Often to Calibrate the Electrode? The frequency that you need to calibrate your pH Electrode depends on many factors such as the nature of test samples, condition of electrodes, and the requirement of the accuracy. For high-accuracy measurements ( ±0.02pH), the electrode should be calibrated before every test; For general-accuracy measurements ( ±0.1 pH), calibrate the electrode every 1-2 weeks. In the following cases, the electrode must be re- calibrated: · The electrode hasn’t been used for a long time or a different electrode is connected. · After measuring strong acid (pH<2) or strong base (pH>12) solutions. · After measuring fluoride-containing solution and strong organic solution. · There is a significant temperature difference between the test sample and the buffer
solution.

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5. pH Measurement
5.1 How to Take pH Measurement 5.1.1 Short press to power on. Remove the storage
sleeve and rinse the electrode in distilled/ deionized water, then shake off the excess.

5.1.2 Submerge the electrode into your sample solution at least 1 inch deep, make a quick stir and hold still. Record the reading as the pH measurement

when it is stabilized ( screen).

comes up and stays on

5.1.3 If necessary, turn on the Auto-Hold function (refer to Section 8.3.3), the reading will be automatically locked when it’s stable for more than 10 seconds. Short
press to cancel the Auto-Hold and keep measuring.
5.1.4 The recommended measurement range of LabSen 835 pH electrode is pH 0 to 12. And the measuring should only be sample test instead of continuous testing. When measuring hydrofluoric acid solutions, the HF concentration should be 0.1 mol/L (0.2 wt% or 2000 ppm). And each measurement should last no more than 1 minute. Otherwise, the electrode performance will be worsened much more quickly than usual.
6. Electrode Cleaning
The meter is only as accurate as the electrode is clean. Always thoroughly rinse off the electrode before and after each measurement with distilled water or deionized water in a container or with a wash bottle. To remove excessive water, just shake them off or blot dry with Kimwipe or lint-free cloth. Never rub the glass membrane of the electrode. Otherwise static electricity will be generated and cause measurement error.

For tough contaminants staying on the glass membrane or junction, refer to the following table for cleaning procedures:

Type of Contamination Lipophilic substances, e.g.
oil and fat deposits
Proteins
Inorganic coatings such as hydrocarbons
Hard, scale-type calcium deposits

Cleaning Agent
Home dish soap water
Apera Electrode Cleaning Solution (SKU: AI1166) commercially available glass cleaning solutions
Apera Electrode Cleaning Solution (SKU: AI1166)

– 9 –

Soaking Time 5 ­ 10 minutes 30 ­ 60 minutes 5 ­ 10 minutes 5 ­ 10 minutes

Type of Contamination Alkaline coatings Acidic coatings Sulfide-containing substances
Unknown substances

Cleaning Agent Apera Electrode Cleaning
Solution (SKU: AI1166) 0.1M NaOH solution
Thiourea
Apera Electrode Cleaning Solution (SKU: AI1166)

Soaking Time
5 ­ 10 minutes
5 ­ 10 minutes 30­ 60 minutes, leave until
junction discoloration disappears.
30 ­ 60 minutes

Use a soft brush to help thoroughly clean off the contaminants. After the cleaning procedure, the pH electrode should always be soaked in 3M KCl solution for 12-24 hours for rehydration. A re-calibration is also necessary before a new pH measurement.

7. Electrode Storage
7.1 Add 3M KCL soaking solution to the electrode storage vial and store the electrode in it. Twist on the vial locking ring tightly. If the 3M KCL soaking soluton is contaminated, replace it with fresh solution. As a rule of thumb, replace the sokaing solution on a monthly basis.

7.2 If you ever find white crystals outside the storage storage vial, it is perfectly normal. It is the 3M KCL soaking solution that crystalizes over time by its nature. Just rinse them off and add in new soaking solution. This chemical is not poisonous or dangerous, and the electrode’s performance will not be affected.

7.3 NEVER store the electrode in pure water like tap, RO, distilled, or deionized water as they could damage the pH electrode. If this happens, immediately soak the pH electrode in 3M KCL soaking solution overnight, then re-calibrate it before use.
8. Parameter Settings

8.1 Settings Menu

Symbol P1

Parameter Setting Contents Temperature Unit

Content °C ­ °F

Factory Default
°F

P2

Automatic Hold

5-20 seconds ­ Off

Off

P3

Automatic Backlight Off

1-8 minutes ­ Off

1

P4

Automatic Power Off

10-20 minutes ­ Off

10

P5

pH Buffer Series Selection

USA ­ NIST

USA

P6

pH Resolution

0.1 ­ 0.01

P7

pH Calibration Reminder

H-hours D-Days (set up in ZenTest App)

P8

Back to factory default

No ­ Yes

– 10 –

0.01 / No

8.2 Parameter Settings

When the meter is turned off, long press to enter parameter settings Short

press

to navigate between P1-P2-P3…P7 Short press

to select the

parameter (starts flickering) Short press to change the parameter Short

press to confirm the change Long press to return to measurement mode.

8.3 Parameter Setting Instruction Examples 8.3.1 Reading Auto-Hold (P02) ­ You can set the reading auto-hold time from 5 to
20 seconds. For example, if 10 seconds is set, when the reading is stable for more than 10 seconds, it will be automatically locked, and the HOLD icon will
be displayed. Short press to cancel the lock. When the setting is “Off” , the Auto. lock function is turned off, that is, the reading can only be manually
locked. Short press to lock or unlock the reading. The HOLD icon will be displayed when reading is manually locked.

8.3.2 Auto. Backlight (P03) ­ You can set the automatic backlight time for 1 to 8 minutes. For example, if 3 minutes is set, the backlight will turn off automatically after 3 minutes; when the “Off” is set, the auto. backlight

function will be turned off, and short press on or off.

to manually turn the backlight

8.3.3 Auto. Power off (P04) ­ The auto. power off time can be set to 10 to 20 minutes. For example, if 15 minutes is set, the meter will automatically shut down after 15 minutes if no operation; when “Off” is set, the auto. power off
function will be turned off. Long press to manually shut down the meter.

8.3.4 pH Calibration Reminder (P07) ­ set X hours (H) Or X days (D) in ZenTest mobile app ­ settings ­ Parameter ­ pH ­ Calibration Reminder. On the meter, you can only check the values that’s been set up on ZenTest App. For example,

if 3 days is set up,

will appear in the lower right corner of the LCD

screen in 3 days to remind you to perform calibration, also in ZenTest App

there will be a pop-up reminder. After calibration is finished or the reminder

setting is cancelled in the ZenTest App,

will disappear.

8.3.5 pH Back to Factory Default (P08) ­ Select “Yes” to recover instrument calibration to theoretical value. This function can be used when instrument does not work well in calibration or measurement. Calibrate and measure again after setting the instrument back to factory default.

– 11 –

9. Instrument Technical Specifications

Range

-2.00 ­ 16.00 pH

Resolution

0.01 pH

pH

Accuracy

Calibration Points

±0.01 pH ±1 digit 1 ­ 3 points

Temperature
Screen
Reading Lock Low-Voltage
Warning Auto. Power-Off
Waterproof Rating Power

Automatic Temperature Compensation (ATC)

0 ­ 100°C (32 to 122°F)

Measuring Range

0 ­ 100°C (32 to 122°F)

Resolution

0.1°C (0.1°F)

Accuracy

±0.5°C (1°F)

3-color LCD screen, Blue: Measurement; Green: Calibration; Red: Alarm

HOLD comes up on screen

flashing, reminder of battery replacement needed

In 8 minutes without operation

IP67

DC3V, AAA alkaline batteries×4

Battery Life
Dimension& weight

Operation up to 2000 hours Tester: 40×40×178mm/133g; Case: 255×210×50mm/700g;

10. Electrode Technical Specifications

Measurement Range Temperature Range Reference System
Junction Reference Electrolyte
Shaft Dimension Membrane Impedance Temperature Sensor

0 ­ 12 pH

0 to 100°C (32 to 212°F)

Silver Ion Trap System

Open

Polymer

ø12*120mm

<400M

– 12 –

30K NTC

11. Electrode Replacement
11.1 Every pH electrode gradually ages and will eventually fail. A typical service life of a pH electrode is 1-2 years depending on many factors such as frequency of use, nature of test samples, how well it is maintained, and etc. We recommend replacing your pH electrode every 1 to 2 years to guarantee the optimal performance.
11.2 Disconnect the old electrode

11.3 Install the new electrode

Never twist the black rubber part to prevent damage.

11.4 After installing the new electrode, please at least perform a 2-point calibration. Refer to Section 4.1 for how to calibrate.
– 13 –

11.5 pH Electrodes Compatible with the Meter for Other Applications
LabSen 335 pH/Temp. Electrode for wastewater, suspensions, and emulsions LabSen 246-5 pH/Temp. Electrode for small-volume solutions and test tubes LabSen 845 pH/Temp. Electrode for strong alkaline and high-salinity solutions LabSen 835 pH/Temp. Electrode for HF-containing and strong acidic solutions LabSen 865 pH/Temp. Electrode for high temerature and caustic solutions LabSen 855 pH/Temp. Electrode for viscous samples LabSen 765 pH/Temp. Electrode for meats PH60S-DE spear probe for foods e.g. cheese, sauce, milk, fruits, dough, etc. GS2-E spear probe for soil direct test PH60F-DE flat probe for surface test
12. Battery Replacement
Please install batteries according to the following steps. *Please note the correct direction of battery installation: The “+” OF EVERY SINGLE Battery MUST FACE UP.
(WRONG INSTALLATION OF BATTERIES WILL CAUSE DAMAGE!)

Loosen the pocket clip Pull off the battery cap

Slide and unlock battery compartment Insert the batteries (all “+” FACE UP)

Open the battery compartment

Press down the battery compartment

Slide and lock the battery compartment

Close on the battery cap (make sure it’s tightly closed with the O-ring.

Otherwise the waterproof rating could be compromised.)

– 14 –

13. Self-Diagonis Function

Error Symbol

Self-Diagnosis information The pH calibration solution cannot be recognized by the meter.

is pressed before measurement is fully stabilized.
During calibration, readings being unstable for over 3 minutes.

pH electrode offset out of range (<-60mV or >60mV)
pH electrode slope out of range (<85% or >110%)
The calibration reminder is triggered. It’s time to perform a new pH calibration.

For how to fix these errors, refer to Section 14 Troubleshooting Guide.

– 15 –

14. Troubleshooting Guide

Trouble

Reason

How to Fix

Incorrect calibration order (Er1)

Always calibrate pH 7 first, then pH 4 or pH 10. Refer to Section 4.2.1.

Calibration Error

Calibration solutions are in poor condition (Er1)

Make sure your calibration standard solutions are fresh and clean, and made by a legitimate manufacturer.

Contaminated electrode (Er1/Er4/Er5)
Aged electrode (Er1/ Er4/Er5)
Dried-out electrode (Er1/Er4/Er5)

Thorougly clean off the electrode. Refer to Section 6.
Replace the electrode.
Soak in the soaking solution overnight to restore.

Electrode is not in full contact with solutions
(Er1/Er4/Er5)

Make sure the storage vial is taken off and the pH glass membrane is fully immersed in the solution (above the junction).

Air bubbles around the Make a quick stir in the solution to remove air sensor (Er1/Er4/Er5) bubbles.

Pressing too fast (Er2)

Wait for the reading to be fully stabilized before pressing to finish the calibration

Contaminated electrode Thorougly clean off the electrode. Refer to

(Er3)

Section 6.

Reading is always slowly changing, won’t stabilize.

Clogged junction (Er3)
Aged electrode (Er3)
Testing pure water e.g. distilled water, RO water
or deionized water

Refer to Section 6.2 to thoroughly clean off the junction. Replace the electrode.
Before test, soak the probe in pH 4.00 buffer solution for half a minute.

Display similar readings in any solutions or stuck
at 7.00

Broken electrode (Er4/Er5)
Instrument defect

If you don’t see any physical damage of the electrode and it’s within the 6-month electrode warranty, contact us for warranty fulfillment;
If there is visible damage, replace the electrode.
Contact us for warranty fulfillment

– 16 –

14. Troubleshooting Guide

Trouble

Reason
Electrode is not in full contact with solution

How to Fix
Make sure the storage vial is taken off and the electrode is fully immersed in the solution (above the junction).

Jumping Readings (generating random numbers)

Air bubbles around the sensor (Er1/Er4/Er5)
Electrode is not properly connected or the
connector is broken.

Make a quick stir in the solution to remove air bubbles.
Check the electrode’s connector, make sure it’s not broken and is correctly connected. Refer to Section 11.3.
Screw on the connector cap to protect the connector when no electrode is connected.

Calibration is successful, but I think the measurement is not accurate

Aged electrode

Replace the electrode.

Wrong buffer standard is selected

Match the buffer standard series with the pH buffers you actually use by changing the setting in P1.

Comparison with other meters, test strips, or
drop tests

To compare with other meters, make sure to perform a 2-point calibration for all meters in the same standards, then measure a 3rd standard solution. Whichever gives more accurate reading in the 3rd standard solution is the more accurate meter.
Test strips or drop tests’ accuracy is not comparable to pH meters’.

Calibration solutions are in poor condition

Make sure your calibration standard solutions are fresh and clean, and made by a legitimate manufacturer.

The electrode is not suitable for your test
sample or testing environment

Refer to Section 11.5 or contact us to find the most appropriate electrode for your specific application.

– 17 –

15. Appendix

Function Comparision of PH60Z Meter and ZenTest® Mobile App

Functions Display
Calibration

PH60Z Meter
Basic digital display

ZenTest Mobile App 1.Basic Mode: digital display+calibration
info (with manual data logger available) 2.Dial Mode: see reading change with
reading alarm range (with manual data logger available) 3.Graph Mode: see the trend of reading
changes (with auto. data logger available)
4.Table Mode: see real time measurement data by every second
(with auto. data logger available)

Press buttons to operate

Operate on smartphone following graphic tutorial

Self-Diagnosis Er1 ­ Er6 icons

Detailed problem analysis and solutions

Parameter Settings

Press buttons to set All parameters can be set up in Settings.
up (except for P7)

Reading Alarm

The screen turns red when alarm triggered; cannot
be setup

Alarm display in all measurement modes, and alarm range can be set up.

Data Management
Data Output

N/A

Manual or Auto. Datalogger; notes can be added to saved data

Share data on your smart phone via email N/A
or other apps

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16. Limited Warranty
We warrant this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge, at option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable to responsibility of APERA INSTRUMENTS, LLC for a period of TWO YEARS (SIX MONTHS for the electrode) from the delivery. This limited warranty does NOT cover any damages due to: Accidental damage, transportation, storage, improper use, failure to follow the product instructions or to perform any preventive
maintenance unauthorized repair or modifications, normal wear and tear, or other external causes or actions beyond our reasonable control To get the fastest warranty fulfillment, go to support.aperainst.com and click “New Support Ticket” on the upper right corner. Then fill in the form and click Submit. Our customer care specialists will be in touch and help you fulfill the warranty as soon as possible.
– 19 –

APERA INSTRUMENTS, LLC
Address: 6656 Busch Blvd, Columbus Ohio 43229 Tel: 1-614-285-3080
Email: info@aperainst.com Website: aperainst.com
– 20 –

References

• Apera Instruments® Meters and Sensors for pH, Conductivity, TDS, Salinity, ORP, DO, Turbidity, ISE
• Support : Apera Instruments

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