Presidium standard+duo probe, new (after oct 2020) models Reading magnifiers that rest on page Although the lens is only

Although the lens is only 10mm dia

and most Sphene

princess 0

you must write down the readings and do some simple arithmetic with a calculator (we do also stock a computerised SG tester

and it doesn't rub off

Presidium standard+duo probe, new (after oct 2020) models Reading magnifiers that rest on page Although the lens is onlyDetails There are two types of probe depending on whether you bought your tester before or after October 2020, please check carefully that you are buying the right one. This probe has the new style connector. It fits the following Presidium electronic gem testers: our ref. Gemtest P2 Presidium's ref. PGTII and also the NEWER versions (this one) of: our ref. gemtest duo Presidium's ref. PDT S7 Not sure which you have? See our information sheet.