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William Faulk
2025-03-19 10:41:50
This is specifically a Leeb hardness tester. (I was unfamiliar with Leeb until I got this unit.) There are readout options on the device that will show you estimated hardnesses in other scales (Rockwell, Brinell, etc.), but they are estimates at best.The way the test works is that a hollow probe is held against the test material, and an internal weight freefalls onto the test material and the probe measures the rebound. One of the drawbacks of Leeb testing is that the test material is supposed to be at least several kg in mass. Without the inertia provided by a significant mass, the device is unable to accurately determine the rebound of the test weight. This makes it not very good for measuring the hardness of hand tools, which is what I wanted to use it for. I have gotten what I think are some reasonable results by holding the small item I want to measure against a heavier item in such a way that they can only move as a single mass. I imagine the more direct the metal to metal contact is, the better that works. It feels like tape or glue would absorb some of the shock. I'm sure that this is still not very accurate, but it might at least be an internally consistent measurement?The probe weight is probably the weight of a coin, but it does have a point. I've found that steel is generally unmarred by testing, but aluminum consistently gains a tiny but visible indentation.The unit comes with a hardness-calibrated steel test cylinder. Measuring the test cylinder comes within a percent of matching the calibration value.There's an included manual that seems like it should be sufficient, but somehow I found it very difficult to understand.Ultimately, if you, like me, wanted to measure tool hardness, this probably isn't the right thing.
Michelle
2024-12-11 16:26:41
This hardness tester is fascinating. I picked this up to use as an aid for selecting metals for welding. This is a great tool to use in the field or on site. Because it is battery powered, it can be taken anywhere. In a quick walk around the farm, I found a dozen different items to test. All readings came out as expected. One word of caution, be sure the find a flat horizontal surface to do the test on. It is hard to believe that this test was just discovered in 1975. A great test kit.A A
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