The new PGI is the only handheld tester in the industry specifically for colored gemstones that helps to indicate 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 common colors, thereby narrowing down the possib le results. With an easy-to-read clear digital LED screen, this smart thermal tester also comes with the Presidium patented replaceable probe tip technology, which ensures minimal equipment downtime. The Presidium Gem Indicator is an enhanced and more convenient handheld version of the revolutionary Presidium Gem Tester/Colored Stone Estimator. The Presidium Gem 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 digital organic LED display. It is simple to use, easy to maintain and quick in giving you intelligent results about your colored gemstones. Features Tests an extended range of 31 different gemstones Color input function to further separate gemstones for more accuracy Easy-to-read results on clear digital LED screen Quick results in less than 6 seconds Industry’s thinnest probe tip (0.45mm) for testing gemstones from 0.2ct Patented refined probe tip Metal buzzer alert and low battery indicator Sleek chrome-brushed ergonomic grip USB port for alternative power source and connectivity Benefits Also able to distinguish diamonds from other colored gemstones Selection of 12 colors available for color for gemstone tested carats (with micro probe tip) Internal library database function of gemstones and their colors Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone, for enhanced accuracy Slim, light, portable and handheld for convenience Compatible with web application OMI to save, share and disco