100% Brand New Tested and pre-calibrated, ready to use. It is ideal for diamonds, platinum, gold, silver, herbs, medications, etc. Multiple weighing modes (gram, carat, pennyweight, grain). Large LCD display. With a clear protective cover. Tare function & Counting function. Auto power off after 300 seconds. Over-load indicator. Specifications: Color: Black Units: g/ct/dwt/gn/oz/ozt Capacity: 50g Accuracy: 0.001g, 0.005ct, 0.2gn. the Minimum weight:about 0.01g Error range:+- 0.003g Power supply: 4* 1.5V AAA batteries (not included) or USB Powered (with USB cable) Working temperature: 0 - 40 (32-104 degree Fahrenheit) Auto off: 300 seconds Item size: 96 * 150 * 64mm Weighing pan diameter:65mm LCD Screen size:75*36mm weight:220g Calibrate method: after turn on the scale,press "MODE" button and hold down,it will show "CRL",then press "MODE" button again, "CAL" will flashing then show "50.000"g and flashing,you need put the 50g weight on the weighing pan,it will flash "PRSS" then show "50.000" g,Calibration completed Package including: List 1 Digital Scale Forceps 10g Weight ( By default, 10g standard weight is sent. If you need 50g standard weight, please place an additional order.) User Manual USB cable List 2 50g Weight