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, and one Platinum solution. Test stones and file are brand new, and will last many uses; these include one extra-large size deluxe test stone surface (6"x3" inches), and one standard sized touchstone (2" x 2" in.), and one long needle-file (5.5 in; 14cm). Use the FREE solid silver sample and gold-plated bar to demonstrate test procedure; BULLION BARS INCLUDE one mini 5 grain (5gr) 999-fine solid silver ingot, and one gold clad bar layered with 24kt gold. Very easy to use. Popular among professionals, hobbyists, coin enthusiasts, business owners, and students alike. Excellent tools. Excellent Value. The 100AX model with the same weighing modes and accuracy may be substituted for the 100AS scale.