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User’s Manual
Hardness Tester
Operating Manual
1. Technical Specifications
1.1 Principle of Measurement
Hardness Value HL
This is a method of measurement that was introduced in the year 1978 by the engineer
D. Leeb “HDL”. The hardness value HL is calculated from the ratio between the impact
and rebound velocity of the impact body multiplied by 1,000.
The greater the hardness of the measured material, the greater the rebound velocity.
If we consider a certain set of materials like steel, aluminum, etc., the HLD value with
which the above-mentioned pieces were measured represents a direct hardness value
and, as such, can be used for a further comparison with other hardness values (Brinell,
Vickers, Rockwell, Shore, etc.).
Its most common applications are:
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Identification of materials in storage
Measurements in difficult access points
Measurements in limited spaces
Hardness variation in pieces of large size
In situ measurements of large, heavy pieces
Control of already installed pieces
Control of pieces in production
Its main features are the rapidity of the test and the documentation of results.
Impact Handheld Durometer
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