IMI Machine Tools Pvt. Ltd. Offers Hardness Tester with Cast Iron Body. IMI Machine Tools Pvt. Ltd. Is an ISO 9001:2000 accredited company. The Hardness Tester with Cast Iron Body come in 6 categories Rockwell measurement is, by direct reading, Brinell measurement is done using Brinell Microscope. In the hardness tester the loading is done by means of proportionate weights and lever. The load application is by hand or by a load selector and does not need any outside motive power. The load application is controlled by dashpot mechanism thus avoiding shock or jerk.