Duo gem tester (Presidium PDT-II) Options_For the partially sighted A pen-probe is guaranteed for

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

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

electrical work

SIZE OF WEIGHING PLATFORM: 63 x 75mm

Duo gem tester (Presidium PDT-II) Options_For the partially sighted A pen-probe is guaranteed forSummary 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