CASIO DE-12E Series Ergonomic Desktop Calculator User Guide

DE-12E Series Ergonomic Desktop Calculator

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Specifications

• Model: DE-12E, JE-12E
• Power Supply: Battery
• Functions: Basic Calculations, Tax Calculations, Currency
  Conversion

Product Usage Instructions

Safety Precautions

Before using the product, make sure to read and follow these
safety precautions:

• Avoid pressing the LCD screen or subjecting it to strong impact
  to prevent cracking.

• If the LCD screen cracks, do not touch the liquid inside.
  Contact a physician if the liquid gets on your skin, in your mouth,
  or eyes.

• If battery fluid leaks, rinse it off immediately. Contact a
  physician if it gets into your eyes.

Basic Calculations

For basic calculations using the DE-12E or JE-12E models:

• Perform addition, subtraction, multiplication, and division
  operations as needed.

• Use the designated function keys for specific calculations like
  CUT, ADD2, etc.

Tax Calculations

To calculate taxes:

• Press and hold the TAX key until SET appears.
• Input the tax percentage and perform calculations
  accordingly.

Currency Conversion

For currency conversion:

• Select the desired currency rate using the EXCH function.
• Input the exchange rate for different currencies as
  required.

FAQ

What should I do if the LCD screen cracks?

If the LCD screen cracks, avoid touching the liquid inside.
Rinse with clean water if the liquid gets on your skin or in your
eyes. Contact a physician immediately.

How do I clear calculations on the calculator?

To clear calculations, use the clearing function available on
the calculator. Refer to the user manual for specific
instructions.

Can I change the currency conversion rates on the

calculator?

Yes, you can change the currency conversion rates by following
the instructions provided in the user manual under Currency
Conversion section.

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&/
DE-12E JE-12E
User’s Guide
1

· Be sure to keep all user documentation handy for future reference. · In this User’s Guide, some key notations are shown in simplified
form.
C1
l l or B
2

Safety Precautions
Thank you for purchasing this CASIO product. Be sure to read the “Safety Precautions” before using this product to ensure that you use it correctly. Be sure to keep all user documentation handy for future reference.
Danger Indicates something that creates the major risk of death or serious personal injury. k Button Type and Coin Type Battery Precautions Take care to ensure that a battery will not be swallowed accidentally. Particular care is required to keep batteries away from children. Should a battery be swallowed accidentally or if there is a possibility that a battery has been swallowed, immediately contact a physician. Swallowing a battery can result in chemical burns, mucosal tissue penetration, and other serious problems that create the risk of death.
3

Warning Indicates something that creates the risk of death or serious personal injury. k Display Screen Do not press the LCD or subject it to strong impact.
Doing so can cause the LCD glass to crack, creating the risk of personal injury.
Should the LCD become cracked, never touch any of the liquid inside. LCD liquid getting on the skin creates the risk of skin irritation. Should LCD liquid get into your mouth, immediately rinse your mouth out and contact your physician. Should LCD liquid get in your eyes or on your skin, rinse with clean water and then contact your physician.
k Battery Precautions
Should fluid leaking from a battery get on your skin or clothing, immediately rinse it off with clean water. Battery fluid getting into the eyes creates the risk of eyesight loss, etc. Rinse the eyes and then immediately contact a physician.
4

Caution Indicates something that creates the risk of minor personal injury or physical damage. Observe the precautions below. Failure to do so can cause a battery to rupture, creating the risk of fire, personal injury, and soiling of nearby objects by leaking fluid. · Do not try to take a battery apart and never allow a
battery to become shorted. · Do not charge a non-rechargeable battery. · Do not expose a battery to heat or throw it into fire.
Battery Precautions Observe the precautions below. Failure to do so can cause the battery to explode or leak flammable liquid or gas. · Do not burn a battery or dispose of it in an incinerator, or by mechanical crushing or cutting. · Do not subject a battery to excessively high or low temperatures during use, storage, or transport. · Do not subject a battery to excessively low barometric pressure during use, storage, or transport.
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B

Important Precautions
· If you suspect that the calculator is operating abnormally due to static electrical charge or some other problem, press A to restore normal operation.
· Avoid dropping the calculator and otherwise subjecting it to severe impact.
· Never try to take the calculator apart. · Never bend or twist the case. · Wipe the unit with a soft, dry cloth to clean it. · Replacing the battery or blocking the calculator from sunlight while
battery power is low may cause your tax rate setting, currency conversion rate setting, or memory contents to be changed or lost. Replace the battery as soon as possible when it becomes weak and correct the rate setting, if necessary. · The contents of these instructions are subject to change without notice. · CASIO COMPUTER CO., LTD. assumes no responsibility for any loss or claims by third parties which may arise from the use of this product.
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Contents
Safety Precautions ······························································· 3 Important Precautions ·························································· 6 Power Supply········································································ 8 Basic Calculations ································································ 9 Tax Calculations ································································· 12 Currency Conversion ·························································· 13 Specifications ····································································· 15 Battery Replacement·························································· 15
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Power Supply
Two-Way Power System provides power even in complete darkness. · Even if you do not use the calculator, you should replace the battery
at least once every seven years. · The replace battery icon ( ) will appear in the lower right corner
of the display when battery power is low. · If the display becomes dim and difficult to read, or if nothing
appears on the display when you press A (especially when lighting is dim), you probably need to have the battery replaced. · The battery that comes with this unit discharges slightly during shipment and storage. Because of this, it may require replacement sooner than the normal expected battery life.
k Auto Power Off Function
Auto power off: Approximately 6 minutes after last key operation · If the Auto Power Off function turns off power, press A to restore
power.
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Basic Calculations

(DE-12E)
F CUT UP 5/4

5 4 3 2 1 0 ADD2

(JE-12E)
F CUT 5/4

4 3 2 1 0 ADD2

6 ÷ 3 × 5 + 2.4 ­ 1 = 11.4 2 × (­ 3) = ­ 6

“F”

A

6/3*5+2.4-1=

2*3>=

5 ÷ 3 = 1.66666666…

“F” “CUT, 2” “UP, 2” (DE-12E) “5/4, 2”

5/3= 5/3= 5/3= 5/3=

$ 1.23 3.21
­ 1.11 2.00
$ 5.33

“CUT, ADD2”

123+ 321111+ 2.=

12 + 23 = 35 45 + 23 = 68
7 ­ 5 = 2 2 ­ 5 = ­ 3
2 × 12 = 24 4 × 12 = 48
45 ÷ 9 = 5 72 ÷ 9 = 8

“F”

23++12=

45=

5–7= 2=

12**2= 4=

9//45=

72=

9

0. 11.4 ­ 6.
1.66666666… 1.66 1.67 1.67
1.23 4.44 3.33 5.33

K

K

K

K

­ 3.

K

K

K

K

‘4 × 5 = 10

“F”

49*5=

200 × 5% = 10

“F”

100 + (100 × 5%) = 105 “F”

500 ­ (500 × 20%) = 400 “F”

30 = 60 × ?%

? = 50 “F”

12 = 10 + (10 × ?%) ? = 20 “F”

$120
100% ? ($160)

? ($40) 25%

“F”

2005& 1005&+ 500*20&-
30/60& 12-10&
120+25& –

10. 105. 400.
50. 20. 160. 40.

8 × 9 = 72 ­) 5 × 6 = 30
2×3= 6 48

“F” (m)*1

o8*9l

M

5*6m

M

2*3l

M

n

M

5 × 6 = 30 2 × 8 = 16
46

12 ÷ 2 = 6 12 ÷ 5 = 2.4 12 ÷ 8 = 1.5
9.9

7.8 × 89 = 694.2

4.56 × 23 = 104.88

12.36

799.08

“F”

A5*6= GT

28= GT &2 GT

“F” (m)*1 Ao12l/2= GT M

n/5= GT M

n/8= GT M

& GT M

“F” (m)1 Ao7.8l89= GT M

4.56l*23= GT M

n GT M

& GT M

30. 16. 46.
6. 2.4 1.5 9.9
694.2 104.88
12.36 799.08

1 If the “EXCH” indicator is displayed, press m and confirm that “EXCH” is not displayed.
2 & recalls the value stored (accumulated) in grand total memory.

10

2 + 3/ = 6

“F”

2+3C4=

4

2 +/ 7 = ­5
­

2+-7=

­ 5.

5 + 77/ = 12

5+77’=

· “E” (Error) will appear if the calculation result exceeds the upper calculation limit of the calculator. If this happens, press A.
· The value displayed when a calculation error occurs is a rough approximate value. Example: If 1.23 is displayed along with “E”, it indicates a value of approximately 1.23 × 1012.

k Clearing Calculations
· To clear the calculator except for independent memory and rate settings, press A.
· To clear independent memory only, press o.

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Tax Calculations

· To set a tax rate Example: Tax rate = 5%
Ah(Hold down until SET appears.) m 5 h

TAX

%

· You can check the currently set tax rate by pressing A and then m.

· Tax rate = 5% $1503 ???4 *5

“F”

A 150

TAX+

V

$1054 ???3 *5

“F”

A 105

TAX-

W

3 Price-less-tax 4 Price-plus-tax *5 Tax

4
157.5 V
3
100. W

TAX

*5

7.5

TAX

*5

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Currency Conversion

· To toggle between the Memory Mode (A) and the Conversion Mode (B)

(A)

(B)

EXCH
000000000000. m

EXCH
0.

· To set conversion rates

Currency 1 (C1) is your home country currency, and so it is always

set to 1. Currency 2 (C2), Currency 3 (C3) and Currency 4 (C4)

are for three other currencies, and you can change these rates as

required.

Example: Conversion rate $1 (C1 home currency) = 0.9 euro for

Currency 2 (C2)

Ah(Hold down until SET appears.) C 0.9*6 h

C2 EXCH RATE
0.9

· You can check a currently set conversion rate by pressing A and then, C, D, or b.
*6 For rates of 1 or greater, you can input up to six digits. For rates less than 1 you can input up to your calculator’s maximum number of digits, including 0 for the integer digit and leading zeros (though only six significant digits, counted from the left and starting with the first non-zero digit, can be specified). Examples: 0.123456, 0.0123456

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Conversion Rate Setting C1 ($) = 1, C2 (EUR) = 0.9, C3 (GBP) = 0.75 108 EUR $ ? (120)

“F” (m)*7 A 108 CB

C1

EXCH

C $110 GBP ? (82.5)
“F” (m)*7 A 110 BD

C2 EXCH
108.
C3 EXCH
82.5

B 108 EUR GBP ? (90)
“F” (m)*7 A 108 CD

C1

EXCH

C3 EXCH
90.

C2 EXCH

C

*7 If there is no “EXCH” indicator displayed, press m to display it.

Conversion Calculation Formulas

C2 C1 … A/X C1 C2 … AX C2 C3 … (A/X)Y C3 C4 … (A/Y)Z C3 C1 … A/Y C1 C3 … AY C2 C4 … (A/X)Z C4 C2 … (A/Z)X C4 C1 … A/Z C1 C4 … AZ C3 C2 … (A/Y)X C4 C3 … (A/Z)`Y
· A = Input or displayed value, X = C2 rate, Y = C3 rate, Z = C4 rate

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Specifications
Power Supply: Two-Way Power System, with solar cell and one button type battery (CR2025)
Battery Life: Approximately 7 years (1 hour operation per day) Operating Temperature: 0°C to 40°C (32°F to 104°F) Dimensions (H) × (W) × (D) / Approximate weight (including battery): DE-12E: 35×140×188 mm (13/8″× 51/2″×77/16″) / 295 g (10.4 oz) JE-12E: 24.4×111×177.5 mm (15/16″×43/8″×7″) / 210 g (7.4 oz)
Battery Replacement
Contact an authorized CASIO service center to replace the battery for this product.
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CASIO COMPUTER CO., LTD. 6-2, Hon-machi 1-chome
Shibuya-ku, Tokyo 151-8543, Japan
SA2406-B © 2022 CASIO COMPUTER CO., LTD.
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