The JB-300B impact testing machine is used to measure the resistance of metal materials to impact under dynamic loads, in order to determine the quality condition of materials under dynamic loads. This machine is a semi-automatic control testing machine with simple operation and high work efficiency. It is controlled by swing, impact, and release devices, and can automatically swing and prepare for the next test using the remaining energy after punching the sample. It is particularly suitable for laboratories that continuously conduct impact tests and industries such as metallurgy and mechanical manufacturing that conduct a large number of impact tests. The JB-300B impact testing machine complies with the national standard GB/T3808-2002 "Inspection of Pendulum Impact Testing Machines" and conducts impact tests on metal materials according to the national standard GB/T229-1994 "Charpy Notch Impact Test Method for Metals".