... mm)2 .Friction of pointer: 0.65±0.15(N)3. Sphere semidiameter at the end of the flip ... 4. Rigidity of flip tensioned spring: 785.0±40.0(N/m)5. Location of flip hammer’s hook release: “100 ... / T 23-2001 China JJG 817-1993 China Models N can be used for testing: - Concrete items 100 ... from 50 to 100mm) Technical data: Concrete Test HammerModel N Model LImpact energy 2,207Nm0,735NmMeasuring range10 to 70N/ ...