The Impact Tester is a laboratory test machine, which is suitable to determine the crushability test that was developed by F.C. Bond.

• The Impact Tester consists of two pendulum-mounted hammers, each weighing approximately 30 lb, and mounted to simultaneously strike equal blows on opposite sides of each rock specimen.
• The crushability test is to be performed on ten or more representative pieces of broken stone. Each is to pass a 3-in. square opening and be retained on a 2-in. square opening. More specimens will increase the reliability of the test results.

The impact tester is designed to be operated by one individual operator. Loosing electricity will shut down the magnets and impact hammers will drop when strained.