The Infyniti Bolt 500g x 0.1g digital scale is a sturdy well built dependable unit. This scale comes with a maximum capacity of 500g with a graduation of 0.1g. It weighs in Grams (G), Ounces (Oz), Grains (Gn), and Carats (Ct). It is powered by 2 x AAA batteries which are included with this scale. The digital display is backlight by an LED for easy viewing. The scale uses an auto calibration on start up to ensure accuracy and is backed by a manufacturers 30 Year Limited Lifetime Warranty.