Diamond Pen / Diamond Test Pen / Diamond Thermal Conductivity Meter / Diamond Discriminator Hardness Tester,3Pcs 9042014429140

Diamond Pen / Diamond Test Pen / Diamond Thermal Conductivity Meter / Diamond Discriminator Hardness Tester,3Pcs 9042014429140

1. Control pin 2. Three color display lamp 3. Power indicator lamp 4. Preparation indicator lamp 5. Power switch \/ adjustment button 6. Battery...

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