Duo gem tester (Presidium PDT-II) Options_For the partially sighted diamond is singly refractive

diamond is singly refractive

The Apex works fine on all 'brilliant' (round) cuts

A pen-probe is guaranteed for one month (see "Guarantee")

by touching it with your finger) will give incorrect results

SIZE OF WEIGHING PLATFORM: 63 x 75mm

Duo gem tester (Presidium PDT-II) Options_For the partially sighted diamond is singly refractiveSummary 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