Product Accurate Multiple Units g, oz, ozt, dwt,gn and ct. Capacity: 50g/ 1.7637oz/ 1.6075ozt/ 32.15dwt/ 771.62gn/ 250ct Readability: 0.001g/ 0.001oz/ 0.001ozt/ 0.001dwt/ 0.02gn/ 0.005ct Accurate Operation Delivers accurate results to ensure your creation is deliciously perfect. How to Calibrate: Turn the scale by pressing ON/OFF Key. Wait for the display to show '0.000g', the press and hold 'MODE' Key till the display shows 'CAL', then release. Press 'MODE' Key again, display will flash 'CAL' followed by the required calibration weight. Place the required calibration weight on the center of the platform, display will show "PASS", then return to normal weighing mode. Calibration is completed Repeat above steps if something goes wrong. 6 Kinds of Units Accuracy & Capacity Super High Precision Mutil-Function Measure diamond , jewelry,pearl,coins, gold ,silver,lab,carat , coffee beans,pill ,powder You Will Get 1 x Digital powder scale 1 x tweezers 1 x weighing tray 1 x 50gram calibration weight 1 x User guide 2 x AAA batteries