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This gem indicator is the only hand-held tester in the industry specifically for colored gemstones. It indicates diamonds and up to 31 different types of colored gems based on their thermal conductivity and even features a color input function that allows users to select from a range of 12 common colors, thereby achieving more accurate results. The indicator probe consists of two linked thermometers; One which is heated electronically, while the other is cooled by the gemstone being tested. The difference in temperature creates an electrical output, which is then amplified and displayed on the new easy-to-read clear digital organic LED display screen. Industry’s thinnest probe tip (0.45mm) for testing gemstones from 0.2ct Retractable thermoelectric tip that maintains constant pressure against gemstone Patented refined changeable probe tip which ensures minimal equipment downtime Metal buzzer alert and low battery indicator USB connection to PC for more value-added functions