American Weigh Scales (AWS) QS-500 - Manual (Page 5)

4. To return to normal weight display (gross weight),
remove any items from the weighing platform and
press the ON/OFF/TARE key again to re-zero the
scale.
VII. Calibration
Calibration and adjustment are performed at the factory.
However, the weighing range can shift slightly during
shipping. Also, due to changes in local acceleration of gravity
around the world, adjustment is recommended when moving
the scale from one location to another. To check calibration:
1. Place the required calibration weight on the scale
and note the displayed value.
2. If the displayed value is not within acceptable
tolerance (see chart below), adjustment is required.
Model Acceptable
Tolerance (±)
Calibration
Weight
Recommended
Accuracy Class
QS-500 0.2g 500g OIML M2
VIII. Adjustment
1. With the scale OFF, press and hold the MODE key
then press the ON/OFF/TARE key until the display
shows a random number. Now release both keys.
2. Press the ON/OFF/TARE key again. The display will
show “Zero” then “500.0g”.
3. Gently place a 500g weight on the center of the
platform and press the ON/OFF/TARE key again.
The LCD will display “PASS” then “500.0”.
4. Calibration is complete. If the scale shows “ H ”, an
error has occurred - Turn off the scale and repeat
steps 1 to 3 above.