Needles of gold of known purity (carat) for use with a touchstone: 8ct, 10ct, 12ct, 14ct and 18ct gold; and 999 silver.
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how many times can i use the strips before replacing them
Each strip can be used once or twice and there are 60 strips in a book. Also, a replacement book of strips is only £2.00.
How do you use these needles to test gold karat between 9K to 24K? I still don’t get the method of how to use it.
The touchstone method (test-needles must be used with a touchstone and acids) is for the experienced jeweller who knows what to do, it's quite complicated. Our gold testers are much simpler, you do not have to use the touchstone method with our testers (though you can if you want).
Instructions can be found in our article more methods of testing gold - scroll down to TOUCHSTONE TESTING. If, after reading the instructions, you say to yourself, "I don't understand the method" – then do not use it, our testers do not require you to.