Precious Metal Verifier, Electronic Diamond Tester Pen with Retractable Thermoelectric Probe & Clear, Easy-to-Read Dial, Capable of Testing 16 Types of Gemstones for Jewelry Verification

Features: 1. Retractable thermoelectric probe tip ensures constant pressure between the probe and the gemstone. 2. Thinnest probe tip (0.6mm) for testing gemstones as small as 0.02 carats. 3. Metal alarm buzzer ensures probe tip contact with the gemstone during testing. 4. Clear and easy-to-read analog dial. 5. Can distinguish 16 types of gemstones. Specifications: Product Name: Multi-purpose Gemstone Measuring Instrument Length: 125 mm (4.93 inches) Width: 90 mm (3.55 inches) Height: 70 mm (2.76 inches) Weight (excluding batteries): 220 grams (7.76 ounces)

• 【Reliable Accuracy】: Includes a metal alarm buzzer to ensure continuous contact between the probe and gemstone during testing, guaranteeing consistent and reliable results instantly without delays.
• 【Retractable Probe Design】: Equipped with a retractable thermoelectric probe that maintains consistent pressure against the gemstone, enabling detection of diamonds as small as 0.02 carats with its precise 0.6mm probe.
• 【Thermal Conductivity Principle】: This diamond testing instrument utilizes thermal conductivity to accurately distinguish and identify diamonds and moissanite, featuring an easy-to-read analog dial for clear results. Capable of differentiating 16 types of gemstones.
• 【Easy Calibration】: Features built-in plug-in glass and a calibration (CAL) test disk for straightforward device calibration according to the testing environment. Note: Calibration may require adjustment post-transport.
• 【Wide Application】: Ideal for testing and measuring diamonds and gemstones across various sectors including the gem industry, academic institutions, laboratories, jewelry manufacturers, and retail jewelers.