Ohaus 21 Piece Calibration Weight Set 1mg to 100g, ASTM Class 1. Manufactured to international standards (ASTM and OIML), Ohaus calibration mass sets are available in a variety of styles for a wide range of uses. In addition to the conventional shapes, Ohaus also offers hooked and slotted masses for use in physics. This precision weight set meets ASTM Class 1 adjustment tolerances and is ideal for applications requiring a very high degree of accuracy. Construction: Stainless steel. Shipping weight: 5lbs. Weight: 1mg to 100g. Number of pieces: 21. Set includes: 1 x 1mg, 2 x 2mg, 1 x 5mg, 1 x 10mg, 2 x 20mg, 1 x 50mg, 1 x 100mg, 2 x 200mg, 1 x 500mg, 1 x 1g, 2 x 2g, 1 x 5g, 1 x 10g, 2 x 20g, 1 x 50g, 1 x 100g, tweezers, hinged cover box & foam packaging for each weight. Per set. Ohaus #: 80781027.