Once the tester got used to the difference between WME and Relative Humidity it worked quickly and efficiently. This device costs about half the price of others I've considered. I was able to find a chart/graph online showing the correlation between WME (Wood Moisture Equivalent) and Relative Humidity. It was very helpful. This device works best in WME mode for external applications. I ordered an extra 5" probe but couldn't get it to work and the "remote" contacts worked intermittently. Otherwise I would give this tool 4 stars. Overall I'm glad I bought this device anyway, I just use a feeler gauge that plugs right into the tool.
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