Radio Shack EC252 User Manual
Cat. No.
OWNER’S MANUAL
Please read before using this equipment.
Metric Conversion Calculator
INTRODUCTION
Your
CONTENTS 

Keys and Functions ............................  3 
Operation ..............................................  7 
Turning on the  7 
Correcting Entry Errors ...................  7 
Calculation Errors ...........................  8 
Using the +/– Key .........................  10 
Calculation Examples ...................  10 
Memory Calculations ....................  14 
Conversion ...................................  16 
Care .....................................................  22 
Replacing the Battery ...................  23 
Specifications ....................................  26 
©1999 Tandy Corporation.
All Rights Reserved. RadioShack is a registered trademark
used by Tandy Corporation.
2
KEYS AND FUNCTIONS
— Converts standard to metric measurements.
— Converts metric to standard measurements.
+/– (°F °C ) — Changes a displayed number from positive to negative and vice versa. Also converts Fahrenheit to Celsius and vice versa.
3
2
÷ (acrem ) — Performs the division function. Also converts acres to square meters and vice versa.
ON/C — Turns on power. Also clears the last entry when pressed once and clears the whole calculation when pressed twice.
7 (incm) — Enters7. Also converts inches to centimeters and vice versa.
8 (ftm) — Enters8. Also converts feet to meters and vice versa.
9 (milekm) — Enters9. Also converts miles to kilometers and vice versa.
× (acrehectare) — Performs the multiplication function. Also converts acres to hectares and vice versa.
MRC — (Memory Recall/Clear) Recalls an answer from memory when you press it once. Clears the memory when you press it twice.
4
2  2  
4 (in 
 cm ) — Enters4. Also converts 

square inches to square centimeters and vice versa.
2  2  
5 (ft 
 m ) — Enters5. Also converts 

square feet to square meters and vice versa.
2 2
6 (mile km ) — Enters6. Also converts square miles to square kilometers and vice versa.
– (fl.ozml) — Performs the subtraction function. Also converts fluid ounces to milliliters and vice versa.
M– (Imp.tonkg) — Subtracts from and keeps the answer in memory. Also converts imperial tons to kilograms and vice versa.
3  3  
1 (in 
 cm ) — Enters1. Also converts 

cubic inches to cubic centimeters and vice versa.
3  3  
2 (ft 
 m) — Enters2. Also converts cu 

bic feet to cubic meters and vice versa.
5
3 (gall) — Enters3. Also converts US gallons to liters and vice versa.
M+ (yardm) — Adds and stores a calculation answer in memory. Also converts yards to meters and vice versa.
0 (ozg) — Enters0. Also converts ounces to grams and vice versa.
. (lbkg) — Enters the decimal point. Also converts pounds to kilograms and vice versa.
= (Imp.gall) — Gives the answer to a calculation. Also converts Imperial gallons to liters and vice versa.
+ (Imp.fl.ozml) — Performs the addition function. Also converts Imperial fluid ounces to milliliters and vice versa.
% (KJKC) — Figures percentages. Also converts kiloJoules to kilocalories and vice versa.
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OPERATION
TURNING ON THE
Press ON/C to turn on the calculator.
Notes:
•The calculator turns off automatically if you do not press any key within about 11 minutes.
•When you turn the calculator off, previous entries are cleared.
CORRECTING ENTRY ERRORS
If you enter an incorrect value, press ON/C once. Then enter the correct value and continue your calculation.
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To clear the display for a new calculation, press ON/C twice.0. appears, then begin the new calculation.
If you press an incorrect operator key (+,
CALCULATION ERRORS
ERROR appears in the upper left corner when:
•A calculation result exceeds 8 digits to the left of the decimal point. This is an overflow error (see “Estimating Calculation Results”).
•A memory calculation result exceeds 8 digits to the left of the decimal point. Memory contents remain unchanged.
•You try to divide by 0.
To clear an error, press ON/C.
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Estimating Calculation Results
If you perform a calculation that results in an overflow error, you can estimate the correct result (to 8 significant digits) by following these steps.
1.Count the number of digits displayed to the left of the decimal point.
2.Remove the decimal point.
3.Add as many zeros to the right of the number as there were digits to the left of the decimal point.
For example, the displayed value ERROR 1.0142064 is estimated to equal 101,420,640.
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USING THE +/– KEY
Press +/– to change the displayed value from positive to negative or from negative to positive.
Note: MINUS  appears for a negative value.
CALCULATION EXAMPLES
Basic
You Press  You See 




256 + 378 =  634. 


471 – 223 =  248. 


15.5 × 2.3 =  35.65 


17.2 ÷ 2.5 =  6.88 


24 +  24. 


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