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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 (0.5 fl oz) test acid. You will receive one 10k solution, one 14k solution, one 18k solution, one 22k solution, one Silver solution, one Platinum solution--each in new box sealed with shrink-wrap. All materials are brand new and will last many uses. DigiWeigh 100AS scale allows you to choose from g, oz, ct, gr/gn; Scale Capacity/Accuracy: 100/0.01 g, 3.527/0.0005 oz, 500/0.05 ct, 1542.8/0.2 gr; also features TARE function and INCLUDES calibration weight; manufacturer's Lifetime Warranty. Authentic Culti Diamond Selector II with 60-day money back guarantee; includes leather pouch; easy & reliable; can distinguish diamond from white corundum and YAG. Use the mini solid silver bar to practice/demonstrate test procedure, or simply keep as investment. Popular among professionals, hobbyists, coin enthusiasts, and business owners alike. Excellent tools. Excellent Value. Great gift idea.