Pen-probe for kee gold tester, model M509-GM Options_With light in its case it's smaller

in its case it's smaller an neater than other diamond testers

and it only needs to weigh down to 0

if you are not a diamond dealer or experienced jeweller you must be certain you are testing a stone that has read 'diamond' or 'Moissanite' on a standard diamond tester

for weighing precious metals

Pen-probe for kee gold tester, model M509-GM Options_With light in its case it's smallerSummary Replacement pen probe for KEE gold tester (model M 509GM). Please check carefully that you are ordering the correct pen probe, this one is for the KEE tester only. The Kee tester was discontinued in 2025. We have pre ordered the factory's entire production. We will be taking delivery of 200 shortly (September) then another 200 in December, then that's the end, there will be no more. We anticipate that this will be enough to last until February