Each country has its own gravitational discrepancies. Check that your scale has been calibrated for your location.
All Presidium scales are factory pre-calibrated. Currently the PCS-50LFT is Legal For Trade for New York, California, Arizona, Florida, and Texas.
The scale’s weight capacity has been overloaded. Limit your load to 50ct/10g for PCS-50LFT and 100ct/20g for PCS-100LFT.
Inconsistent readings occur when the scale is placed in a vibrating environment or on an uneven surface.