Acculab GSI-2001 Digital Scale For Weighing Gold, Gem Stones & Precious Metals. This new Acculab GSI-200 digital scale. The scale measures in grams, ounces, troy ounces and pennyweights. It has a 2000 gram capacity and is accurate to .001 grams (readable to 1 gram). A handy hold key retains the reading on the display. It has a plastic removable square platform that measures approximately 5 3/8" x 5 3/8" (135 x 135 mm). An angled LCD display for easier reading. The built in lock down bracket retracts when not in use. This runs on a 9V Alkaline battery which is included and the scale can also run on an AC adapter (not included). The auto off feature saves battery life (approximately 50 hours of battery life). This is precalibrated at the factory Two year manfacturer warranty. It measures approximately 7 7/8" x 5 3/8" x 2" (200 x 135 x 50 mm).