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By certification 
This type test hammer is used to test the concrete compressive strength of construction and bridge...
Specifications:
test range: 10~60 Mpa
impact energy: 2.207J (0.225kgf.m)
impact stroke: 75mm
friction of slider: 0.5~0.8N
spherical radius of impact pole: 25+/-1mm
calibration value on test anvil: 80+/-2
dimension: 278*D54mm
weight: 1kg
Specifications:
test range: 10~60 Mpa
impact energy: 2.207J (0.225kgf.m)
impact stroke: 75mm
friction of slider: 0.5~0.8N
spherical radius of impact pole: 25+/-1mm
calibration value on test anvil: 80+/-2
dimension: 278*D54mm
weight: 1kg