What ranges are Leeb hardness testers used to measure?

According to the Leeb principle, as long as the material has a certain degree of rigidity and can rebound, the accurate Leeb hardness value can be measured. However, there is no corresponding conversion relationship between the Leeb hardness of many materials and the hardness of other standards. The Leeb hardness tester is only equipped with 9 Conversion table for various materials. The specific materials are as follows: steel and cast steel, alloy tool steel, gray cast iron, ductile iron, cast aluminum alloy, copper-zinc alloy, copper-tin alloy, pure copper, stainless copper.