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The KEE GOLD TESTER Model M-509GM is an accurate affordable and “user friendlygold/platinum purity analyzer. This metre is a quick and easy nondestructive way to test gold or platinum items to verify content of gold alloys within the popular industry ranges from 10 to 24 karat and platinum. The easy to read analogue metre movement allows each individual user after calibration to become very efficient and comfortable testing gold on his/her Kee Gold Tester. Now you can test gold or platinum in seconds and be confident of the gold content. First calibrate the tester to a known piece of 18K yellow gold per the Fast Start Instructions. Then plug the pen probe into the Kee Gold Tester with the Red + lead furnished. Clean a small test area on your gold/platinum item and place your gold/platinum on the testers metal test plate. Lightly touch the pen to the cleaned spot on your gold item and get an accurate reading instantly! The testing pen probe comes with a cap that has a cleaning tip for rubbing your test item to remove dirt or oil. Always be sure to replace pen probe cap after each use. Not doing so will cause your pen to dry out prematurely.