The Rockwell hardness of ferrous, non-ferrous metals and also materials that are non-metal can be determined using the HR-150D digital hardness tester. It finds wide usage in the hardness testing for materials used in heat treatment. Examples would be for quenching, tempering, hardening etc. It features a digital LCD reading of about 12 Rockwell scales. The HR-150D is able to convert the values to Vickers and Brinell hardness scales. It has an integrated printer and can be connect to a PC through the means of a RS-232C cable. It is highly accurate, reliable, durable and also cost effective. Its measuring range is 20-88HRA, 20-100HRB, 20-70HRC. The dwelling time is 60S. The hardness is indicated on a digital LCD display. The unit’s loading control is automatic.