The GEMORO SUREGAUGE XL provides the extra precision of 0.01mm readability that you need and includes a gem weight estimating book, a high-setting attachment, and a rubberized zippered carrying case. Used for estimating the weight of any shape diamond or gemstone (mounted or loose). Powered by (1) supplied LR44 (357) battery. The Suregauge XL is Reese’s Law compliant. Made in China.