Mumbai-based mahisa electronics provides manufactures ultrasonic hardness testermodel 8701. The principle on which this ultrasonic hardness testerse work on the principle of ultrasonic contact impedance method. Due to microscopic indentation, the product provides offers the advantage of nondestructive test due to microscopic indentation. Following are some technical features of this ultrasonic hardness tester which include: the hardness of the metal is indicated on the meter by applying the probe against the test object. The diameter of the probe is 38 mm and its length is 215 mm. Dimensions of the display meter is 240 mm x 130 mm x 300 mm. The weight of the probe and display meter are 0.6 and 2.0 kg, respectively. Some electrical specifications include: the power supply required is 230 volts ac. The antiparallax mirror is helpful in minimising the reading error. The range of rockwell c test scale is 20 to 70 hrc and 0 to 100 graduations are made on neutral scale. The indenter is vickers diamond pyramid with angle 136 deg. Ac power supply cable, one high and one low hardness specimen, carrying case for meter and probe together and flat probe shoe are the standard accessories of the product. These hardness testers find their applications in are useful for testing hardness on flat surface, curved surface, finished surface and testing in any position such as horizontal, slanted, vertical upwards, vertical downwards and also to depths of 20 mm. Ac power supply cable, one high and one low hardness specimen, carrying case for meter and probe together and flat probe shoe are the standard accessories of the product.
