Replacement probe (pen) for Kee gold tester (model M-509GM).
The probe (pen) 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 "up to a few thousand tests" (which could mean less than 1000); they also say a probe should be replaced after a year, but we don't know if that's because they don't expect it to last for more than a year or because they want to sell more.
Comments from customers:
- The KEE tests on average about 40 items a day and lasts about 6 months, 5000 tests. The solution in the probe outlasts the tip which becomes soiled from testing scrap. We replace the probe when reliability drifts and more regular calibration is required with our 18ct control sample.
- We get around 3 months and test around 10 times a day, often 15 times a day. Overall we think they last well.
It's variable, some probes last approximately 12- 18 months each (about 2000 tests) and some 9 - 12 months (about 1000 tests).
- Our probe only lasted 3 months, we are very disappointed.
- The probes seem to last us at least a year, I would say that it was at least 200 individual tests, and perhaps even up to 400 tests over that period.
Conclusion: expect a probe to last between 3 and 18 months (though it's recommended you replace it after a year) - providing you take care to replace the cap firmly after use.