X Durometer / Hardness Tester

X Series Durometer

X Series DurometerX Series Handheld DurometerAsker X-C1-L DurometerAsker X-F DurometerF-D Hardness Scales & Indentor TypesX Series Durometer Operation

X Durometer / Hardness Tester

Series X

  • x durometer, x-a, x-al, xp-a, xp-al, x-c, x-c1l, xp-c, xp-c1l, x-d, x-dl, xp-d, xp-dl, x-f, xp-f, x-ja, x-jal, xp-ja, xp-jal, x-b, x-bl, xp-b, xp-bl, x-c2, x-c2l, xp-c2, xp-c2l, x-cs, xp-cs, x-e, x-el, xp-e, xp-el

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?

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 Model‘L’ ModelApplicationStandard
X-AX-ALNormal rubber & softer plasticsASTM D 2240
X-CX-C1LSoft rubber, sponge, textile windingsJIS K 7312/Asker C
X-DX-DLHard rubber & plasticsASTM D 2240
X Series Special Scales
Standard Model‘L’ ModelApplicationStandard
X-JAX-JALNormal rubber & softer plasticsJIS K 6301
X-BX-BLSemi rigid rubber & plasticsASTM D 2240
X-C2X-C2LSoft rubber & spongeAsker C2
X-CSPolystyrene foamAsker CS
X-EX-ELSoft & cellular rubberJIS K 6253

X Durometer Selection

ScaleAsker FAsker CShore AShore D
IndentorRectangularHemisphericalFlat pointCone point
MaterialUrethane foam
& non-woven fabric
Soft rubberNormal rubberHard rubber & plastic
StandardAsker FJIS K-7312 ASTM D-2240 ASTM D-2240
Measuring Force????1 kgf1 kgf5 kgf