This EASY to use genuine JSP kit will determine the karat value and purity of Gold Jewelry, scrap, bars, coins, and much more! *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! This 4 Piece kit includes: - JSP 10K Gold Testing Acid Solution 0.5 oz. - GTE 2''x2'' White Testing Stone - GTE 2''x2'' Black Testing Stone - Easy to read and follow instruction booklet with color chart! JSP, a reputable Jewelry supply company since 1980, Acids are always fresh!