X Durometer / Hardness Tester

Series X

  • High performance and accuracy
  • Calibration cert traceable to NIST included
  • Optional ISO-17025 calibration available

The Asker Model X Durometer is a precision instrument for measuring the hardness of various types of rubbers and plastics. Durable metal cases are rugged enough for a production environment. X handheld durometers are easy to use. The easy operation allows for rapid testing with repeatable results. The Asker High Performance X series has an accuracy of ±.75 point and is available in Type F for soft materials like sponge rubber and urethane foam. X Model durometers are available in ASTM D 2240 Types: Shore A Hardness, Shore D Hardness, Asker C Hardness, as well as Asker F Hardness. Type F hardness testers use their own weight to determine hardness.

Add ‘P’ to the model number to specify optional peak indicator, for example XP-A. Add ‘L’ to the model number to specify extended presser foot models.


As the X durometer is pressed against the sample, the material resistance force and indentor spring load balance. The depth of the indentor is measured, which provides a measure of the material’s hardness. Values are based upon a 100 point scale (accuracy ±.75 point). However, as time elapses the indicator will “creep” back so that a reading taken a few seconds after the indentor makes contact with the sample will be less than the peak reading. Asker durometers offer a peak indicator as an option to more closely monitor the difference between peak and “creep”.

What’s Included with the Durometer?

Asker X durometers are sold as kits. All new durometer purchases include: durometer, hard plastic carrying case and 3-Point Calibration certificate traceable to NIST.

X Series Common Scales
Standard Modelwith Peak Indicator‘L’ ModelApplicationStandard
X-AXP-AX-ALNormal rubber & softer plasticsASTM D 2240
X-CXP-CX-C1LSoft rubber, sponge, textile windingsJIS K 7312/Asker C
X-DXP-DX-DLHard rubber & plasticsASTM D 2240
X-FXP-FUrethane foam, non-woven fabricAsker F
X Series Special Scales
Standard Modelwith Peak Indicator‘L’ ModelApplicationStandard
X-JAX-JALNormal rubber & softer plasticsJIS K 6301
X-BX-BLSemi rigid rubber & plasticsASTM D 2240
X-C2XP-C2X-C2LSoft rubber & spongeAsker C2
X-CSPolystyrene foamAsker CS
X-EXP-ELX-ELSoft & cellular rubberJIS K 6253

X Durometer Selection

ScaleShore AAsker CShore DAsker F
IndentorFlat pointHemisphericalCone pointRectangular
MaterialNormal rubberSoft rubberHard rubber & plasticUrethane foam
& non-woven fabric
StandardASTM D-2240 JIS K-7312 ASTM D-2240 Asker F
Measuring Force1 kgf1 kgf5 kgfWeight of the durometer

X Durometer Dimensions