... force of pointer: 0.65 N 1 resiliometer, millstone Rebound Test HammerApplication:ZC3-A resiliometer, in accordance with JGJ/T23-2001 ... , pointer convenient for adjusting friction force, the first choice of instrument suitable for on-site nondestructive testing.Main Technical Parameters:Length ... , bounce tension spring, buffer spring, screwdriver, instruction book, etc. Rebound Test Hammer