PRODUCT DETAILS This JSP GTE Silver Testing kit is both genuine and easy to use! Simply scratch the test stone with your jewelry and apply a drop of the acid to the stone and watch the results appear! Solutions sold separately. This listing includes: - (2) GTE 2''x4'' Test Stones New in Box with Rubber backing to ensure non-slip desktop testing! Can be used over a thousand times, simply clean with baking soda/water between uses. - (1) 1/2 oz bottle of JSP Silver Testing Solution - (1) Easy to follow instruction booklet with color chart A MUST-HAVE for anyone who invests in silver! If you have any further questions, please feel free to contact us. We look forward to serving you in the future.