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W-M-250
USA
determination of the strength of concrete
immediate indication of concrete strength
ECONOMICAL STRENGTH TESTING
non-destructive testing of hardened concrete

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

Weight

6 lbs. (2.7kg)

Size

5” x 3” x 14” (127 x 76 x 355mm)

Shipping Weight

6 lbs. (2.7kg)

Carrying Case

15 1/2” x 11 1/2” x 2 1/2”

Dimensions

8” x 7” x 16” (203 x 178 x 355mm)