James NDT W-M-250 Manual Concrete Test Hammer

James Manual Concrete Test Hammers are an economical tool for quick and easy measurement of concrete compressive strength test in the field.  It will also provide an index of hardness and compressive strength for other construction materials such as mortar, brick, and rock.

SKU: JAM-WM250 Category: Tags: ,


Manual Concrete Test Hammers are the traditional instruments used for the non-destructive testing of hardened concrete. James NDT W-M-250 Manual Rebound Concrete Hammers are easy-to-use instruments that provide 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; which is correlated to concrete compressive strength.

The manual concrete test hammer, also known as a Rebound Hammer, Schmidt Hammer, Swiss Hammer, or 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 IV.

All James Concrete Test Hammers conform to ASTM C-805*, BS-1881 #202 and other international standards.

* Standard Test Method for Rebound Number of Hardened Concrete

Features of the James Manual Concrete Test Hammer

  • Easy-to-use manual calculation of the mean rebound number.
  • ┬áImpact Energy level of 1.6 ft. lbs. (0.225 kgm / 2.2 Nm) and come complete with carrying case and carborundum stone.
  • The minimum verifiable strength is 1400 PSI (10 MPa)

It is recommended that calibration of the test hammers be checked regularly – usually after about 2000 strokes.
The James Calibration Anvil (W-C-7312) has been designed
for just that purpose.

Optional Accessories:

W-C 7312 Test Anvil