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AD-300 Precision Durometer

Made in Germany
Precision Durometer AD-300
Click images to enlarge.
The Check-Line AD-300 precision durmometer is designed to measure the hardness of vulcanized or thermoplastic rubbers, elastomeric or soft plastic materials and silicon products via indentation resistance.

The AD-300 durometer meets the requirements of most international standards, including:
  • DIN 53505 (A, D)
  • ISO 868 (A, D)
  • ISO 7619 (A, AO, D)
  • ASTM D 2240 (A, D, C, O)
The AD-300 is German-engineering with the highest build employing an ultra-low friction movement and an indentor machined to the highest standards. Together with the ergonomic enlarged foot this enables you to take highly accurate and repeatable measurements.

The AD-300 Hardness Tester is available in Shore A, D, C and O scales

Hardness readings are displayed on an easy-to-read analog scale. An optional MEMORY POINTER holds readings until manually reset, allowing the operator to concentrate on the measurement task. The AD-300 Hardness Tester will be delivered with operating instructions, carrying case and calibration certificate.


  • Includes Traceable Calibration Certificate
  • Ergonomic barrel and 18mm footer offers stable platform for measurement eliminating "wobble"
  • Large easy to read dial indicator (0-100 units)
  • Memory pointer optionally available
  • Highly accurate and repeatable
  • German-engineered and built
  • Conforms to DIN 53505, ISO 868, ISO 7619 and ASTM D 2240

Operating Principle

Operating Principle

Conformance to International Standards

Model ASTM D2240 DIN 53505 ISO 868 ISO 7619
AD-300-A X X X X
AD-300-C X
AD-300-D X X X X
AD-300-O X

Indentor Types

Type Indentor Shape Force
A Flat cone point, 35º Included Angle
Soft rubber, plastics, and elastomers, printer's rolls.
822 Gr
C Flat cone point, 35º Included Angle
Medium hard elastomers and plastics. Also useful to avoid surface marks.
4536 Gr
D Sharp cone point, 30º Included Angle
Hard rubber and plastics such as thermo plastics, flooring and bowling balls.
4536 Gr
O 3/32" Spherical
Very soft elastomers, textile windings, soft granular materials. Use below 20 Duro A.
822 Gr

Related Products

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Durometer Test Stand
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- Spring loaded lever for fast & precise travel
AD-100 Durometer
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Durometer Tester
- 18 mm diameter footer provides stable basis for testing and conforms to all International Standards


Dial face diameter57 mm
Total length121 mm
Range0 - 100
Footer Diameter18 mm
StandardsDIN 53505 (A, D)
ISO 868 (A, D)
ISO 7619 (A, A, D)
ASTM D 2240 (A, D, C, O)

Buy Now

Item Description Price
Precision Analog Durometer, Shore A Scale
Precision Analog Durometer, Shore D Scale
Precision Analog Durometer, Shore C Scale
Precision Analog Durometer, Shore O Scale
Memory Pointer Option for AD-300 Durometer
In stock
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Lead Time Varies, Please contact us for availability.