Standard Electronic Gem Tester (Presidium PGT II) 15X to 30X magnification loupes allow time for us to

allow time for us to send it back to the supplier for evaluation)

but you should also light it from underneath (which gives a totally different view)

for gemstones)

the boxes are a bit scuffed

Standard Electronic Gem Tester (Presidium PGT II) 15X to 30X magnification loupes allow time for us toDETAILS 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