This product completely consistent with national and industry technical specification and standard as follows:
1. GB/T9138-1988
2. JJG817-93
3. JGJ/T23-2001
HT-225 Concrete Test Hammer applied to inspect compressive strength for general building components, bridges and all kinds of concrete components (include in slabs, beams, columns, bridges for concrete).
Product Specification:

Measuring strength ranges: 10-60MPa
Normal impact energy: 2.207J(0.225Kgf. M)
Strike hammer stroke: 75mm
The friction force of pointer slider: 0.5N± 0.8N
Spherical radius of strike rod: 25mm± 1mm
The rebound values calibrated on steel anvil: 80± 2 Dimensions: Φ 54*278mm
Weight: ≈ 1Kg