A reliable, inexpensive timing device has been constructed for use with the Kentron microhardness tester. This device, which consists of a photoelectric switch coupled to an electric timer, enables the duration of loading to be precisely controlled, provides a convenient method for measuring the loading rate, and facilitates adjustment of the tester. The use of this timing accessory increases the efficiency of operation of the microhardness tester and reduces operator error, thereby improving the accuracy and reproducibility of microhardness testing results. The device should be adaptable to other hardness testers.