Tire Durometer - Longacre Tech

How to use a durometer to measure the hardness of your racing tires.
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[@strandolph]

A couple of things are missing here... It may seem obvious, but the lower the reading, the softer the material. And the knob on the top is for calibration. If you use the durometer on something impenetrable like glass or steel, it should read exactly 100. Use the knob at the top to recalibrate to 100.

[@kelo05]

What is the knob on the top of the durometer

[@هشامفرج-ن9ك]

Price / Egypt \Rubber test