... explanation is as follows:• 1, press "ON/OFF" button start-up, wait for 3 seconds display 0.0;• ... calibration function as follows:According to the "ON/OFF" button 3 seconds to LCD display-Jordan farmar value, at ... tray model and display the weight value, according to PCS button to display the p25pcs, (p50, p75, p100) UNIT ... of the same item in the ChengPan calculate. digital jewelry mini pocket scale