Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g Built-in light

Built-in light

Not diamond (and not Moissanite)

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

you missed the stone and touched the setting)

the sensor must be kept dust-free

Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g Built-in lightDETAILS 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