The KASSOY Professional Acid Gold Testing Kit offers jewelry professionals the quality they deserve with traditional acid testing. Stored in a sleek KASSOY wooden box secured with magnets, the kit includes a 4x3” testing stone, a machined gold testing star for testing .999 silver, 10k, 14k, 18k, 21k, and 22k gold, a rare earth magnet, and six 1/2oz bottles of JSP Testing Acids. Closed box measures 6.5 x 4.25 x 4.25”