10k, 14k, 18k, 22k, Platinum & Silver test acids. 6 original PuriTEST brand acids. Each bottle contains 1/2 fluid ounce (0.5 fl oz.) acid for test procedure. Only 1 drop needed to test the gold. Each 1/2 ounce bottle contains enough acid to test up to 500 pieces of jewelry, coins, antiques, and any other precious metal item. Also test instructions so you can start right away. 1 Large Pro Quality Testing Stone measures 6" x 3" x 1/4" (inches). So large you can test several pieces at once! Instructions included. Acids guaranteed fresh and always come in sealed box.