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Very easy to use and includes instructions. Sealed box contains six (6) bottles test solution; each bottle contains 1/2 fluid oz (0.50 fl oz) test acid. You will receive one 10k solution, one 14k solution, one 18k solution, one 22k solution, one Silver solution, and one Platinum solution--each new in box sealed with shrink-wrap. Test stone and loupe (magnifying glass) are brand new, and will last many uses. Test stone measures 2" x 2" (inches) wide, and the lenses of the loupe measure 21mm diameter. Electronic diamond tester (Diamond Selector II by Culti) can distinguish diamond from white corundum and YAG. Buzzer will sound to alert you when the probe's tip touches metal. Real diamond are indicated by sound and light signal. I kindly offer 60-day money back guarantee on this diamond tester. Very easy to use. Popular among professionals, hobbyists, coin enthusiasts, business owners, and students alike. Unique Gift Idea. Excellent tools. Excellent Value.