Checkline AD-300-O Precision Analog Durometer, O Scale

Price: $ 750.00

Checkline AD-300 Precision Durometer
Measures according to
DIN 53505 (A, D)
ISO 868 (A, D)
ISO 7619 (A, D)
ASTM D 2240 (A, D, C, O).

The Checkline AD-300 precision durometer 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 manufacturer's certificate. A full calibration certificate can be ordered optionally.


  • 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
  • Traceable calibration certificate Optional


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)

Conformance to International Standards

ModelASTM D2240DIN 53505ISO 868ISO 7619

Indentor Types

TypeIndentor ShapeForce
AFlat cone point, 35 Included Angle
Soft rubber, plastics, and elastomers, printer's rolls.
822 Gr
CFlat cone point, 35 Included Angle
Medium hard elastomers and plastics. Also useful to avoid surface marks.
4536 Gr
DSharp cone point, 30 Included Angle
Hard rubber and plastics such as thermo plastics, flooring and bowling balls.
4536 Gr
O3/32" Spherical
Very soft elastomers, textile windings, soft granular materials. Use below 20 Duro A.
822 Gr

Related Products

Durometer Test Stand

  • Provides improved accuracy & repeatable when used by separate operators
  • Spring loaded lever for fast & precise travel


Durometer Tester

  • Includes NIST-Traceable Calibration Certificate
  • Conforms to ASTM D-2240, DIN 53505, ISO 868, JIS K 7215 and ISO 7619. Asker C model conforms to JIS K-7312
  • 18 mm diameter footer provides stable basis for testing and conforms to all International Standards

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Product Price
Checkline AD-300-O Precision Analog Durometer, O Scale $750.00
Accessories Price
AD-300-MEM Memory Pointer Option for AD-300 Durometer $75.00



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