KEE electronic gold tester (model M-509GM)
KEE electronic gold tester (model M-509GM)
KEE electronic gold tester (model M-509GM)
KEE electronic gold tester (model M-509GM)
KEE electronic gold tester (model M-509GM)
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KEE electronic gold tester (model M-509GM)

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Ref: KEE

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Out of stock today, expected back in stock on Wednesday (31 May).

UK company, easy telephone support

Calibration samples for electronic gold testers

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Pickup available from Quicktest (WD18 8PH)
Email us or call on 01923-220206 for appointment.


I am wary of recommending new electronic gold testers, having tried a few that looked promising but turned out to be unreliable - the KEE is a good one! 

Making it with a simple analogue meter seems to have solved the problems found with 'computerised' electronic gold testers. This is definitely the most reliable electronic tester I have seen.

The price does not include a sample of 18ct and 22ct.  If you deal in jewellery you will have these - if not, you will need the 18ct sample for testing general jewellery; plus the 22ct sample if you want to test above 18ct accurately.


  • Size 90 X 170 X 50mm (3.5 X 7 X 2 inches)
  • No acids involved, the probe contains a harmless salt solution.
  • Tests gold from 8ct to 24ct (the scale is marked "K" instead of "ct" because it's American)
  • The pen probe provides up to 3000 tests.
  • Simple analogue meter, good reliability
  • Simply touch pen probe to the item, result is shown in 2 or 3 seconds, very fast
  • Includes extra contact leads for large items that will not fit on the test-plate.
  • Easy calibration with a sample of 18ct (+ a sample of 22ct gold if you want to test above 18ct accurately) - not included in the price of the tester
  • As with every tester (whether you spend £15.00 or £12,000.00) it only tests the surface. This means you must file the surface with a fine needle-file (supplied with each tester) in a place where it won't show, to remove any surface plating. 



  • Carrying pouch
  • Battery
  • Diamond-impregnated file
  • Very clear illustrated instruction booklet
  • An extra set of leads for testing very large items that will not fit on the test-plate (though I have never known anyone who has needed to use these).


To test 9ct to 22ct you will need a sample of 18ct yellow gold (it must be exactly 18ct). This is to 'match' the electronics in the tester to the carat (technical term: calibrate). You cannot use the tester without this.

If you want to test 20ct to 24ct accurately you will also need a sample of exactly 22ct.

You can use anything with a UK hallmark or you can add one (or both) calibration samples to your order, click on View Optional Extras.

UK traders will already have hallmarked items, which is why we don't include the calibration samples in the price of the tester.


The tester is guaranteed for one year.

As of Summer 2022:

  • so far, we've sold a few hundred KEE testers and have had seven returned. Of the seven, one was perfect, two had dry (used-up) probes (pens), one had a flat battery, three were faulty. 
  • We also find that some are faulty when we receive them from the supplier in the USA (unlike other companies, we test every item thoroughly!) - we return these to the supplier, we do not sell them to our customers.

Probe (pen)

A probe (pen) is included with your purchase, if you want a spare, click on View Optional Extras.

Probes (pens) have a one month guarantee - a probe (pen) is like a felt pen, if you don't replace the cap firmly it dries out. The manufacturers say it will give "up to a few thousand tests" (which could mean any number less than this). They also say it should be replaced after a year (a year from the date on its sticker).

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. 
  • Our probe only lasted 3 months, we are very disappointed.
  • It's variable, some probes last approximately 12- 18 months each (about 2000 tests) and some  9 - 12 months (about 1000 tests). 

  • 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. 
  • Sometimes a probe lasts a few months but sometimes only a few weeks.


  • Generally, a probe lasts between 3 and 18 months but it can be as long as 2 years or as short as 6 weeks - the guaranteed is one month.
  • Although the manufacturers recommend you change it after a year, if it's still working, it's fine. Providing you are still able to calibrated the tester, you will get accurate results.

      More information

      Click here for more details and a review

      Click here if you already have a KEE tester and need a replacement probe.

      Click here see how easy it is to use, download a copy of the instruction manual (.pdf). Compare this with the instructions for other electronic testers!


      Ask a Question
      • Can the KEE electronic gold tester be used straight away to test up to 9ct anything higher will need to be calibrated with 18ct - 22ct.?

        It is supplied thoroughly tested and calibrated, it can be used straight away to test any carat.

        However, as the fluid in the probe (pen) gets used up, the readings become inacurate and you have to keep calibrating it. 
        Obviously, we recommend getting a calibration sample (either from us, or any scrap hallmarked item) sooner rather than later.
        The calibration sample should be 18ct.  You only need a 22ct sample (in addition to the 18ct sample) if you want to test 22ct to 24ct accurately.

      • Does the tester tell you non gold?

        The short answer is: yes. But it depends on what you mean by "Does the tester tell you non gold".

        The tester tells you how much gold is in the metal alloy (the percentage purity, but measured in "carat" rather than "percentage").
        So if you see that the amount of gold is zero (the red section of the dial)...then the metal does not cointain any gold, it is "non gold".
        So the answer to your question, ""Does the tester tell you non gold" is: yes.

        If, by "Does the tester tell you non gold" you mean: if you can see the metal is not gold will it tell you what the metal IS?   
        Then the answer is: no. 

        If, at this point, you are confused because you don't understand that the metal will be an alloy (in the case of gold jewellery and coins, a mixture of gold and other metals), or you don't understand 'carat', or you don't understand what can legally be described as 'gold' in the UK - then you need The Gold & Silver Buyer's Handbook.

      • Do you supply the replacement probes in the UK and how much do they currently cost?

        Yes we sell the probes, currently (Spring 2022) £49.50.
        Yes we hold stock here in the UK.

      • Do you calibrate this device before despatch?

        Yes, every tester is carefully checked and calibrated before dispatch.