The Presidium 100 Carat Scale is the latest innovation of carat weighing technology, utilizing Advanced Circuitry Design and Surface Mount Technology (SMT). This portable carat scale promises reliability and consistency for long periods of continuous usage. Designed specially for jewelry traders on the move by the leading maker of gemological instruments, its compact size and rugged build allow for easy-to-travel usage and durability. One year warranty. Selection mode: gram/carat/ozt/grain. Graduation: 0.01ct/0.002g/0.0001ozt/0.05gr. Continuous operation without shutting off. Does not require recalibration during operation. Powers down after 10 minutes from last measurement. Powered by 4 AAA batteries. Dimensions: 114 mm x 152 mm x 4 mm.