2 Bead mm Gauges Measuring Beading Millimeter Tool This is a new set of 2 gemstone carat gauges These are great for measuring gems They fit in your pocket comfortably Each gauge is made of steel These gauges accurately measure in carat sizes: 0.01, 0.02, 0.05, 0.10, 0.20, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 3.50 and 4.00