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This diamond tester features both an automatic and manual mode with advanced testing features. Identify CZ, diamonds, sand other stones such as sapphires. Designed with linear display for increased information; adjustable gain for small stone sizes. Fast warm up time â ten seconds! Auto shut-off with a push button switch. Unique new anti-fade circuit which compensates for stone heating. Low battery indicator for accurate readings.Please contact us with any questions. Thanks for looking!