Review on VCCA High Accuracy Jewelry Diamond Tester II: The Ultimate Thermal Conductivity Meter for Novice and Expert Gemstone Selection by Gina Cravalho
Cheap and bulky but works
Awkward to use - you have to wait for it to warm up, then adjust the sensitivity and hold it properly to get a reading. But it was cheap and great for my use when testing sapphire watches.
- Great design
- Sad hardware
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