NZ Digital Scale MK-650 650 x 0.1gFeatures: Super contrast, backlight 2 x AAA batteries (Included) Full Tare Range Capacity Energy saving auto power off function (60 seconds off) Capacity: 650g x 0. 1g Units: g oz gn ct ozt dwt Scale Size: 120 x 65 x 19mm Platform Size: 74 x 52mm Calibration: Turn on the scale. Press and hold the [M] key until the LCD display "CAL" , release the [M] key. Press [M] key again, the display will show "CAL" followed by the required calibration weight