The 100AX accurately measure to 1/100th of a gramme, 1/20th of a carat, 1/5th of a grain or 1/2000th of an ounce! This scale is easy to operate with it's 4-key button selection. The clear plastic lid can also be used as an expansion tray. It operates on 5.1cm AAA" batteries which are included! High quality strain gauge load cell system makes it accurate in full capacity range. High density ABS housing and metal support makes it very durable. Large high contrast LCD display makes the readouts clear to read. TARE function makes it much easier to weigh liquid or powder. Attractive blue back lit used in dark. User can switch off the back lit to save power. Crystal clear cover can be also used as tray. All necessary calibration weight materials are included to easily calibrate scale.