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Asker X Durometer High Performance Asker Durometer

Made in Japan
High Performance Asker Durometer
Click images to enlarge.
Common Hardness scales:
Shore A Normal rubber
Shore D Hard rubber & plastics
Asker C Soft rubber
Asker F Urethane foam, sponge and polystyrene foam

Special Hardness Scales
Asker JA Normal rubber & softer plastics
Asker B Semi rigid rubber & plastics
Asker C2 Soft rubber & sponge Asker
Asker CS Polystyrene foam
Asker E Soft & cellular rubber

Asker Hardness testers feature portable design, ease of operation, non-destructive measurement and optional peak indicators. Supplied with 3 point NIST traceable calibration cert.

The Asker High Performance series has an accuracy of ±.75 point and is available in Type F for soft materials like sponge rubber and urethane foam.

Asker models are available in ASTM D 2240 durometer Types: Shore A Hardness, Shore D Hardness and Asker C Hardness durometer scales.

Conforms to: JIS K 6253, JIS K 7215, ASTM D 2240, ISO 7619, ISO 868, DIN 53505

Asker Durometer Scales


  • Supplied with NIST Traceable Calibration Certificate (ISO 17025 Optional)
  • High performance and accuracy


As the hardness tester 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 tester makes contact with the sample will be less than the peak reading. The optional peak indicator helps to more closely monitor the difference between peak and "creep" in hardness tests.
Asker Durometer Operation

Asker Durometer Models

Model F

  • Urethane Foam
  • Sponge
  • Non-woven Fabric

Model FP

  • Powder Puff

Exclusive type for foam materials, allowing measurement by placing the tester on the object of measurement. In addition to Model F, Model FP is available for powder puff.

Model C & Model C2

  • Soft Rubber
  • Urethane Rubber
  • Sponge
  • Wound threads (yarn package)
  • Rolled Films
  • Potter's Clay (Kaolin)

Model C is intended for hardness measurement of Soft Rubber, sponge, foamed elastomers, wound threads(yarn package), rolled films, potter's clay(kaolin) and other such soft materials.
For even softer materials, Model C2 is available.

Model CS

  • Polystyrene Foam

This features larger indentor and a more strong spring compared to Model C, thereby making it more suitable for polystyrene foam.

Model A

  • Rubber in general
  • Softer plastics

Has been used for wide applications since being standardized in the ISO.

  • Rubber in general
  • Softer plastics

A hardness tester which conforms with the Japanese Industrial Standards JIS K 6301. One of the most popular types in Japan, but has recently been gradually replaced with the ISO-specified Type A.

Model JAL

  • Rubber in general (Specially for measurement of recessed surfaces)

Especially useful for recessed and/or smaller measurement areas. In addition to the standard Model JAL, long presser foot type are available for another Model applications.

Model B

  • Semi-rigid Rubber
  • Unglazed pottery clay

It uses the same spring load used in Model A. It adopts a conical indentor similar to that of Model D, so as to be applicable to harder measuring objects than can be measured by Model A. It is useful for hardness measurement of unglazed pottery clay and ceramics in green condition.

Model JC

  • Semi-rigid Rubber

Model JC has those hardness testers described in JIS K 6301 as 'suitable for samples found to have a hardness value above 70 according to Model A'. It features higher resolution for hardness measurement of hard rubber.

Model D

  • Hard Rubber
  • Plastics

Similar to Model A, this model is defined as 'Durometer Type D' as described in various domestic and international standards. It is in widespread use for hardness measurement of plastics and hard rubber.

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Indication Range262 degree dial scale
Minimum indication1 point (Accuracy : ±1 point)
Pressure foot Dimensions44 x 18mm Rectangular
Outer DimensionsApprox. 57 x 30 x 76 mm (W x D x H)
Mounting ThreadM6 P1
Weight200 grams


Buy Now

Item Description Price
Shore A Durometer - For Normal rubber
Shore D Durometer - For Hard rubber and plastics
Asker C Durometer - For Soft rubber and sponge
Asker F Durometer - Urethane foam, sponge
Asker Shore A Hardness - Normal rubber with Peak Indicator
Asker C Hardness - Soft rubber & sponge with Peak Indicator
Shore D Hardness - Hard rubber and plastics with Peak Indicator
Reference Specimen (Test Blocks) Type A
Reference Specimen (Test Blocks) Type Asker C
Reference Specimen (Test Blocks) Type D
ISO-17025 Accredited Calibration with Certificate
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.