test hammer

Concrete Test Hammers are ideal for fast, inexpensive, nondestructive estimations of in-place concrete strength. Hammer tests can help determine where test cores should be taken and locate damage from freezing or fire. Useful range covers concrete strengths from approximately 1, 400— 8, 000psi ( 10— 55mPa) . The plunger rod is pressed against a concrete surface until a spring-loaded mass is released, causing an impact on the concrete. Rebound of the mass is registered on the hammer as the “ rebound number” . Included calibration curves provide estimated strength from rebound number, but accuracy is greatly improved by user-produced laboratory correlations with compression tests on the same type of concrete being evaluated. HM-71 Gilson Concrete Test Hammer is an economical alternative to the original Schmidt and meets all published specifications for these devices. The quality Made-in-America unit gives consistent results and provides reliable operation. A durable nylon carrying case with loop handle, carborundum stone for surface preparation, instructions and charts are included with the HM-71. Est. Ship Wt.: 6lb ( 3kg) .