Diamond Gem Saphire Tester

Diamond Gem Saphire Tester

Uses thermal conductivity to test diamonds

gems and watch crystals.

the tester has an electrically heated tip

when held on the item at 90 degrees the tip

will cool down and the thermal conductivity 

will be read to differentiate between different materials.

needs 9v battery

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    Diamond Gem Saphire Tester