This EASY to use genuine JSP & GTE kit will determine the karat value and purity of Gold Jewelry, scrap, bars, coins, and much more! Simply scratch the test stone with your jewelry and apply a drop of the acid to the stone and watch the results appear! *Our goal is to make testing your jewelry FUN, FAST, and EASY! *We promise that our acids are guaranteed to be FRESH! *Each bottle will test hundreds of times! *These small bottles are perfect for traveling with or carrying in a purse or briefcase. Quick & easy to use; instructions included. *A MUST-HAVE for anyone who invests in gold and silver! This 4 Piece kit includes: - JSP 14K Gold Testing Acid Solution 0.5 oz. - JSP 18K Gold Testing Acid Solution 0.5 oz. - GTE 2''x2'' Test Stone with rubber backing to ensure non-slip desktop testing! Test stone can be used over 100 times! - Easy to read and follow instruction booklet with color chart!