Blocks for Accurate Durometer Calibration

Ensure consistent and reliable readings from your durometer with certified hardness test blocks. At GNW Instrumentation, we supply a wide range of Kern and Sauter reference plates designed for internal verification and performance checks of Shore and Leeb hardness testers. Ideal for quality control, calibration routines, and operator training.

Choose the Right Hardness Scale

We stock certified test blocks across multiple measurement scales for both non-metallic and metallic materials:

• Shore A: For rubber, elastomers, soft plastics, and similar materials
• Shore D: For hard plastics and polymer-based components
• Shore A0: For low-density materials such as foam and sponge
• HRC: For Rockwell hardness testing of metals
• HL: For Leeb rebound hardness testers on steels and alloys

Durable, Traceable Reference Materials

All our hardness comparison plates and reference blocks are made from stable materials with certified values, ideal for performing quick functional checks or internal comparisons. Shore test blocks are supplied with clearly marked tolerance ranges, and Leeb and Rockwell references meet standardised specifications for industrial use.

Available individually or as part of a set, our test blocks are a cost-effective way to ensure the reliability of your hardness testing instruments.

Features

• Certified blocks for Shore A, D, A0, HRC and HL scales
• Ideal for functional checks and instrument comparison
• Shore plates supplied with target values and tolerance markings
• Compatible with Kern and Sauter durometers
• Compact, durable, and easy to store

Whether you're validating readings on the shop floor or training new users, GNW provides the test blocks and reference plates you need for accurate and reliable hardness testing.

Need help selecting the right test blocks? Contact our expert team for advice and product recommendations.