American Weigh Scales (AWS) BT2-1KG - Manual (Page 5)

4. To return to normal weight display (gross weight),
remove any items from the weighing platform and
press the T 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
BT2-201 0.01g 200g, 100g* OIML M2
BT2-1KG 0.1g 500g, 100g* OIML M2
*Selectable at calibration time
VIII. Adjustment
1. Press and hold the M key until the display shows
“CAL”.
2. Press the M key again. The display will flash “CAL”
followed by the calibration weight value (see chart).
3. Place the calibration weight on the center of the
weighing platform.
4. Once the weight is accepted, the display will show
“PASS” then return to normal operation. NOTE: If