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RockSchmidt Rock Testing

Article No. 15027

Rockschmidt Type L

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.

Select your model

$2,937.00 excl. taxes & shipping cost


  • 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.

Technical Attributes

  • 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

Delivery Content

Battery charger with USB cable, DVD with software, carrying strap, grinding stone, documentation and carrying bag.
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