please preform the following procedure
Calibration
1. Place the scale on a leveled surface & turn off the scale.
2. Press and hold the "MODE" key and ON/OFF key until the LCD
displays a random number.
3. Now release both keys and press the ON/OFF key once. The
display will read "CAL" and then "1000.0".
4. Place a 1,000g weight on the center of the platform and wait 3 to 4
seconds. The LCD display reads "PASS", then "1,000.0g". Remove
the weight and turn off the scale.
5. Calibration is complete and the scale is ready for use.
check this link for manual:
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