Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g This has a 2-pin plug

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

the sensor must be kept dust-free

- as with all testers

Built-in light

Standard Electronic Gem Tester (Presidium PGT II) Resolution_1g This has a 2-pin plugDETAILS 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