Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g - as with all testers

- as with all testers

a watchmaker's eyeglass and a good quality spring lug remover too - all in a fitted case

Built-in light

specific gravity (relative density) method for testing m | Quicktest

This has a 2-pin plug so we include a 2-pin adaptor

Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g - as with all testersDETAILS Thermal meter, tests for 17 common groups of gemstones (about 40 varieties), enlarge the product picture to see the scale in detail. Works with any stone, loose or mounted in jewellery, even uncut stones. The only condition is that the stone (and tester) must be at room temperature. Instruction manual (pdf download) Video (youtube demonstration) Video (youtube calibration for serial numbers PTG111425 and after. Guide to buying electronic gem