Silver & Gold Testing Kit: 2 Test Acid Bottles + 100g Lab Scale Set includes 1 x 0.5 oz bottle of Gold Test Acid, 1 test stone, and 1 DigiWeigh DW-100AS lab scale Scale allows you to choose from 4 different modes: Carat (ct), Gram (g), Ounce (oz), Grain (gn) Capacity & Accurcary: 500 x 0.05 ct, 100 x 0.01 g, 3.527 x 0.0005 oz, 1542.8 x 0.2 gn The acids will change colors to indicate purity Includes everything shown, plus 2x 50g calibration weights, manual, batteries, warranty information