PTC® Durometers
A durometer is an instrument for testing the hardness of various plastics & rubber. ASTM D2240 Standard Test Method for Rubber Property, Durometer Hardness. This test method covers twelve types of rubber hardness measurement devices known as durometers.

PTC® Instruments manufactures and calibrates durometers to ISO 17025. We offer calibration, repair and certification services. These durometers are available to ASTM D2240, ASTM F1957, JIS K-6301, JIS K-6253, DIN-53505, ISO-7619 and ISO-868 standards including many custom configurations. Our sales department will help you determine the correct durometer for your application. We also offer material testing to determine the correct durometer type and style for your application at no charge.

PTC® manufactures repairs, calibrates and certifies Shore® hardness scale durometers and durometer stands.


306L Durometer Classic 408 Durometer Classic e2000 Durometer 511A Digital Durometer Digital Durometer SmartCable 211A Durometer 201A Durometer 472 Durometer Stand Durometer Operating Stand Durometer Repair & Calibration

PTC Metrology™ is Accredited by A2LA to ISO/IEC 17025 and ANSI/NCSL Z540-1 for durometer calibration. NIST traceable certification is available for any durometer type covered by current ASTM D2440, ASTM F1957, ISO 868, ISO 7619, or DIN 53505 standards. The Calibration Report will include both "as received" and "as left" data on the force curve measurement. Durometer calibration includes: indenter geometry and extension, indicator linearity from 0 to 100, and mainspring force. Other durometer types, custom models, and durometers of any manufacture can also be certified by PTC Metrology™.

See below for some of PTC®'s Custom Durometers...

Composite Foam Durometer 414CF
PTC®'s 414CF ASTM F1957 Composite Foam Durometer

The PTC® Model 414 Type CF Durometers are manufactured and designed to measure the indentation hardness of all generations of foam products: Freon Blown types, Water Blown types and new Composite Foams. The instrument features a low glare aluminum serialized dial with bold, easy to read numbers. The durometer has a maximum reading hand for indicating peak readings test block and carrying case are also included. This product meets or exceeds the current ASTM F1957 standard test method for composite foam hardness, which was created at the task group level within ASTM Committee F24 on amusement rides and devices.

Drywall Durometer
PTC®'s 414USG Drywall Durometer

PTC®'s Model 414USG Durometer measures hardness of drywall sheets during processing. Drywall can be checked for proper curing before the cutting stage. The instrument features a low glare aluminum serialized dial with bold, easy to read numbers. The durometer has a Max Hold hand, which retains the peak reading. A test block and carrying case are included with the instrument.

Foam & Sponge Rubber Durometer
PTC®'s 302SL Foam & Sponge Rubber Durometer

The Model 302SL is a hand-held foam and sponge rubber hardness tester made exclusively by PTC® Instruments. The instrument has the capability to economically test the same type of material checked with an ILD tester. There is no direct conversion from the 302SL scale to ILD readings, however, the 302SL can be used for comparative testing.

Crab & Lobster Shell Durometer
PTC®'s Crab & Lobster Shell Durometers

Developed with the Alaska Dept. of Fish and Game and the Canadian Department of Fisheries and Oceans
  • Used by Fish and Game to Enforce Fishing Regulations.
  • Used by Marine Biologists for Crab Fisheries research.
  • Accurately measures shell hardness
  • Magnetic Max Hand
  • NIST Traceable Certification Available

Renfro Durometer
PTC®'s Renfro Durometer

Developed for National Association of Hoisery Manufacturers (NAHM)

Racing Tire Durometer
PTC®'s Racing Tire Durometer

This durometer specifically tailored to measuring racing tire hardness. The Model 306RL durometer is the first choice for use by tire manufacturers, technical inspectors, race teams, and engineers fast and accurate tire hardness.