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Manual Rebound Hammer
Economical Strength Testing of Hardened Concrete
and Hardness Testing of Materials

Manual Rebound Hammer
Manual Rebound Hammer

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Item# Item Name   Qty Add
W-M-250 Manual Rebound Hammer
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Product Description:

Purchasing Notes

  • Use this in conjunction with the V-C-400 V-Meter MK IV for rapid and accurate estimation of concrete strength.

  • The equipment should be verified for proper operation with W-C-7312 TestAnvil for calibrating James Test Hammers the calibration anvil at regular intervals.

  • All Test Hammers shown here have an Impact Energy level of 1.6 ft. lbs. (0.225 kg) and come complete with carrying case and carborundum stone.


  • Manual hammers for the quick and easy determination of the strength of concrete.

Features and Benefits

  • Easy to use manual calculation of the mean rebound number.

  • All James Test Hammers conform to:

ASTM C-805
ASTM D-5873
Grt. Brit.
ISO/DIS 8045
EN 12 504-2
ENV 206
NFP 18-417
B 15-225
JGJ/T 23-2001
JJG 817-1993

Downloadable Documents (PDF)


Product Details

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


Weight: 6 lbs. (2.7 kg)
Size: 5” x 3” x 14” (127 x 76 x 355 mm)
Shipping Weight: 6 lbs. (2.7 kg)
Carrying Case: 15.5 x 11.5” x 2.5” (394 x 292 x 64mm)
Dimensions: 8” x 7” x 14” (203 x 178 x 355 mm)

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