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Home  >>  Products  >>  Hardness  >>  RockSchmidt Rock Testing

RockSchmidt Rock Tester

RockSchmidt Rock Testing

The Rockschmidt Rock Tester is world's most advanced rebound hammer, with unmatched dispersion characteristics, durability and measuring range has now been fully adapted for rock testing. It is a portable instrument made for the field assessment of rock properties.



  • There are two types available:
    • Type N: Standard impact energy, 2.207 Nm. Recommended for field work. For core testing ISRM recommend that cores should be at least moderate strength (> 80 MPa) and at least T2 size (≥ 84 mm).
    • Type L: Low impact energy, 0.735 Nm. Recommended impact energy in the ASTM D 5873 standard for testing of cores. ISRM recommend for testing on cores of moderate strength and above of at least NX size (≥ 54 mm).
  • Impact Angle Independence: The rebound value is independent of the impact direction.
  • Optimized for Field Work: Tighter sealing against dirt and dust intrusion for longer life. Significantly lighter and more ergonomic than the classic Schmidt hammer. A large number of readings can be saved and downloaded later to a PC.
  • Preset Statistics: Statistics methods recommended by ISRM and ASTM are implemented into the hammer for automatic calculation of the rebound number. The option is also there to define a user specific statistics method.
  • Unconfined Compressive Strength: ISRM recommends a correlation between UCS and the rebound value based on the formula UCS = aebR (where R is the rebound value). A correlation in this format may be defined in the software and downloaded onto the RockSchmidt.
  • Young's (E-) Modulus: ISRM recommends a correlation between elastic modulus and the rebound value based on the formula Et = cedR (where R is the rebound value). A correlation in this format may be defined in the software and downloaded onto the RockSchmidt.
  • Weathering Grade: Impacting on the same location twice can be used to correlate to weathering grade. The ISRM recommended method has been included in the firmware.

RockSchmidt Rock Testing

Technical Data

Technical Data
Impact Energy: (N) 2.207 Nm, (L) 0.735 Nm
Dimensions of Housing: 55 x 55 x 250 mm
(2.16" x 2.16" x 9.84")
Weight: 570 g
Max. Impacts Per Series: 99
Memory Capacity: Dependent on length of test series. Example: 400 series of 10 impacts
Display: 17 x 71 pixel, graphic
Accumulator Duty: > 5000 impacts between charges
Operating Temperature: 0 to 50°C (32 to 122°F)
Type N: Geomorphological applications which investigate the bulk hardness properties of a rock outcrop
Prediction of weathering grades
Relative dating of landforms such as moraines and rock glaciers
Prediction of penetration rates for tunnel boring machines and rotary drum cutters
TypeL: Testing on weak rocks, porous rocks and those with thin weathering crusts
TypeN/L: Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)
Correlation to Young's Modulus
Testing on Blocks: > 100 mm thick
Testing on Cores: N: ≥ 84 mmØ
L: ≥ 54.7 mm Ø



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

Battery charger with USB cable, DVD with software, carrying strap, grinding stone, documentation and carrying bag.
HA-836101 RockSchmidt Type N $2,772.00
HA-836211 RockSchmidt Type L 2,797.00


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