Tare feature to set zero at anytime. Easy to recalibrate to ensure accurate weighing. Auto Off feature to save battery. 2 "AAA" Alkaline batteries included. Dimensions (DxWxH): 4" x 2 5/8" x 3/4". Platform: 2.5" x 2.5". Capacity 650 Grams Accuracy .1 Gram. This is a high quality pocket scale great for use in the laboratory and around the home. Perfect for jewelry, gems, gold, coins, gun powder, envelopes, and much more. This is one of the best values out there. Comes pre-calibrated out of the box. You will be pleased and enjoy years of use out of your scale. High quality strain gauge load cell system for accuracy in full capacity range. Durable ABC housing and metal support for durability. Cover can be used as a tray. Easy button: on/off, mode, Tare measuring units: G, Oz, Ozt, and Ct. Bright backlight Lcd Screen for easy reading.