Replacement probe for Kee gold tester (model M-509GM).
The probe is filled with a salt solution, it it not toxic.
Probes are not guaranteed! - they are like felt pens, if you don't replace the cap firmly they dry out.
The manufacturers say a probe gives "a few thousand tests" though we have had a few reports of them only lasting two or three months (maybe a few hundred tests, maybe less) - so we cannot guarantee how long a probe will last. The following is a guide:
- for a specialist gold-buying business the probe should last 3 or 4 months
- for a jewellery shop with a sideline in buying gold it could last several months
- for just the very occasional testing it might last over a year
The manufacturers say a probe should be replaced after a year. We don't know if that's because they don't expect it to last for more than a year or they just want to sell more.
REMINDER: the probes are not guaranteed, they will dry out if the cap isn't replaced firmly.