A common error when using a durometer is to imbed the foot of the gauge into the specimen by pressing down with excessive force. All Rex instruments are made in accordance with ASTM D2240. This standard states that for types A, B, and O the gauge should be pressed onto the specimen with a load of 1 kg (2.2 lbs.).
The Rex Constant Load Weight for gauges with an 82 gram springload (types A, B, O) slides onto the lower barrel of the gauge, gives it a wider foot, and raises the mass of the gauge to the suggested 1kg. With the load weight on the gauge, all the user has to do is set the gauge on the test specimen - no further pressure is necessary. Thus the Constant Load Weight eliminates the human error that would otherwise occur due to users pressing on excessive or inconsistent force.
Constant Load Weights are precision CNC machined from stainless steel and are polished and calibrated by skilled craftsmen at Rex Gauge Co. in the USA. They are appropriate for use with Models 1600, 2000, DD-4, and DD-5. Note: Increasing foot diameter can affect durometer readings - using the appropriate Test Block Kit can verify durometer operation.
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