Duo gem tester (Presidium PDT-II)

Summary Bench model. A dual tester with both thermal meter and reflectivity meter. Place the probe on the stone to operate analogue meter (the thermal meter, see detail in the extra pictures). Place the stone over the sensor (even if it's in jewellery) to operate the digital meter (the reflectivity meter).  You don't have to use both systems, you can choose one or the other. Includes heavy duty nylon carrying case and a PP3 battery. Also a power supply for mains (has a 2-pin plug so we include a 2-pin adaptor) - note, it is not a battery charger! Guarantee: 1 year Instruction manual (pdf download) Refractive index chart (pdf download) - for 75 common gemstones Guide to buying electronic gem testers (web page) Video Details The thermal meter 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. It is the same as the basic Presidium model (thermal meter only),  it tests for 17 common groups of gemstones (about 40 varieties),  enlarge the product picture to see the scale in detail.  The reflectivity meter works on loose (not mounted) stones with a perfectly flat, perfectly polished surface, than can be rested over the sensor, it is not affected by temperature.  Disclaimer All testers  must be used in conjunction with the user's skill, knowledge and experience. Under no circumstances shall QUICKTEST be liable for direct or indirect loss sustained in connection with any item. Nothing is 100% accurate, you must understand the limitations of any tester you buy. We also suggest you regularly test known samples to check for any obvious faults. Full support given for items you buy from QUICKTEST. Alternatives For a summary of all diamond and gem testers see the Comparison Chart, or see a more detailed explanation of what the various types of tester can (and can't) detect at Electronic Gem Testers.  If you specifically need to test diamonds, consider a diamond tester, they are more finely-tuned for testing diamonds, see our Guide to Buying Diamond Testers.