Sam features higher sensitivity to distinguish between diamonds against a wider range of Moissanite, including low electrical conductivity, metal alert signal to ensure the probe is in contact with gems during testing, no waiting between tests, and a low battery indicator. The thin probe tip capable of testing mounted stones and has a warning alarm when its in contact with metal instead of a stone. It will automatically power off after 10 minutes of inactivity and batteries can last through up to 2,000 continuous tests.