"A Remarkable designed Gemstone Tester with color estimator display for smoothly and seamlessly testing your Precious stone and diamond. The SmartPro Gem-Eye I it was developed to distinguish between diamond and its other simulants using the principles of thermal conductivity. Diamonds, with their exceptional heat conductivity properties are unlike any other simulant, and are therefore not easily replicable. The SmartPro Gem-Eye I is now equipped with a color stone estimator display to assist the user in distinguishing popular colored gemstones form each other. The SmartPro Gem-Eye I 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 an analog dial. High efficiency gem tester Retractable thermoelectric probe tip that ensures constant pressure between probe tip and gemstone Industry’s thinnest probe tip (0.48mm) for testing diamonds as small as 0.01ct LEDs indicator Metal alert LEDs with buzzer sound to ensure that probe tip is in contact with gemstone during testing Easy-to-read analog panel display No waiting time between tests Built-in diamond and simulant test discs for reference"