For the technician that must perform hardness tests on various types of non-metallic materials, Rex Gauge Company now introduces the Multi-Scale durometer test kit. The Multi-Scale base kit consists of a Rex Type A durometer, and your choice of one of more color-coded barrel adapters for D, B, C, DO, O, OO or OOO scales. Changing scales is accomplished by unscrewing one barrel and replacing it with another - no supplementary calibration or adjustments are necessary. A test block, calibrated to the selected scale is also included. The block allows the user to perform quick functional checks on the instrument. The Multi-Scale durometer test kit is made in the USA, and calibrated to the ASTM-D2240 standard for durometer hardness testers.• Size: 2.25" x 6.125"H • Weight: 7.15 oz.