The Presidium Multi Tester III has been developed to help distinguish between colorless diamonds and moissanites using the combined principles of thermal and electrical conductivity. The measuring probe with electronic circuitry is designed to detect and segregate data collected from the gemstones via a customized micro-controller. The information gathered will be displayed within seconds. The Presidium Multi Tester III has been subjected to thorough and extensive laboratory testing, and will give a clear and reliable reading of the gemstone being tested under proper use. However, further supporting tests are advised. Included in your package: Presidium Multi Tester III Metal stone rest User handbook Warranty card Protective carrying case This tester can be powered by either the use of an AC adaptor (optional item sold separately) or through the use of batteries. Please ensure that only the adaptor supplied by Presidium is used.