Each purchase includes the following:10 Karat Gold Testing Solution14 Karat Gold Testing Solution18 Karat Gold Testing Solution22 Karat Gold Testing SolutionSilver Testing SolutionPlatinum Testing Solution2x2 Black Testing Stone with non-slip back, can be used hundreds of times.Detailed instruction booklet.The gold testing solutions will allow you to determine the karat rating of your gold.(Results will be either 0-10k, 10k, 14k, 18k, or 22k-24k.)The silver testing solution will allow you to determine if your silver is either .999 pure silver or .925 sterling silver.The platinum testing solution will allow you to determine if your object is real platinum or palladium.Each bottle contains enough solution for 30-40 tests.Note, 30-40 drops does not fill the bottle completely. May not appear full but each bottle does contain 30-40 drops of solution.