Amazon.com: WOWOHE Digital Food Scales Gram
Press UNIT button for about 2 seconds till 500.00 appears on LCD display. Then release and repress UNIT button once,CAL and 500.00 flick on LCD display. Put a weight 500g on the scale. Turn off the scale when it appears PASS and 500.00g (± 0.05g)on LCD display successively.
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