The W-M-250 Manual Test Hammer is the traditional instrument used for the non-destructive testing of hardened concrete. This easy-to-use instrument provides a quick and simple test for obtaining an immediate indication of concrete strength in various parts of a structure. The minimum verifiable strength is 1400 PSI (10 MPa) to approximately 9000 PSI (62 MPa). All concrete test hammers measure the surface hardness of the material they are testing; this is then correlated to concrete compressive strength.

The manual concrete test hammer, aka rebound hammer, schmidt hammer, swiss hammer, sclerometer, is the most widely used non destructive instrument for compressive strength determination. However, it typically has the largest coefficient of variation; therefore its result should be verified with another non destructive test such as the V-Meter MK III.

Typical Correlation Charts for James Instruments Rebound Hammer

Features and Benefits

• Easy to use manual calculation of the mean rebound number
• All James Test Hammers conform to:

  ASTM C-805	USA
  BS-1881-202	Grt. Brit.
  ISO/DIS 8045	Intl.
  EN12 504-2	Europe
  ENV 206	Europe
  NFP 18-417	France
  B15-225	Belgium
  JGJ/T 23-2001	China
  JJG 817-1993	China