Specifications: Model: HT-225 Standard Impact Energy: 2.207J(0.225Kgf.m) Spring Stretch: 75mm Needle Friction Force: 0.65±0.15(N) Spherical Radius at tip of flip rod: 25 mm±1 mm Shell Size: Φ54* 278mm Average Rebound of Steel Amb: 80±2 ± ± ± ± Weight: 2.2 lbs (1 kg).

Features: Spherical Zero Adjustment Bolt: Spring back is more smooth. Cap/Spring: It has good mechanical properties and good stability. Button Nuts: One click can stretch and contract Scale: The scale is clear, the pointer is smooth.

Operation Instructions: Take out the test hammer and keep the rebound pole upright to the surface.Slowly press the test hammer into the end cover, the hammer will unlock it, the button releases, stop pushing, and remove the test hammer from the surface, you will receive the rebound pole. Test hammer is perpendicular to concrete surface and slowly apply pressure evenly.After a collision with the rebound pole, the rebound hammer will rebound and then lift the pointer up.The value line on the scale indicates the specific value on the scale, meaning the rebound value. Keep the rebound hammer standing on the concrete surface and read the rebound value and record it.If you cant see the reading, press the button to lock the hammer and press the button to lock the movement, move it to another location to read. When the test is finished, push the rebound pole back into the test hammer.