Test device for reliably differentiating between real diamonds, moissanites, synthetics stones (imitations) as well as metal settings.Furthermore, the test device is equipped with an ultraviolet light source, which can be used to analyse and assess the fluorescence of diamonds. Leather case for safe storage of the test device, as standard Metal plate for loose stones included. shut-off after two minutes of nonuse with cap off. Foolproof calibration, and a fail-safe mechanism that lets you pre-test instrument function. Low batteries indicator.