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

4. To return to normal weight display (gross weight),
remove any items from the weighing platform and
press the 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
SM-200 0.02g 200g* OIML M2
SM-500 0.2g 500g* OIML M2
SM-501 0.02g 500g* OIML M2
SM-DR 0.2g 500g* OIML M2
*Can be changed to 100g during calibration by pressing
TARE. See Section VIII.
VIII. Adjustment
1. Turn the scale on by pressing the ON key.
2. Wait for the display to show “0.0g” or “0.00g” then
press and hold the ON key for a few seconds until
the display shows “0”, then release.
3. The display will flash “g” along with the default
calibration weight value (see chart above). Place the