Yep the meter has calibration for specific density Mike of each wood plus temp. Correction this one is not a surface probe meter it puts a electric field inside the wood I tested it against known reference several times , I had to deal with so much green wood in my first year of bow making I have kinda got anal about dry wood . I bought a surface probe meter and tested it out it was terribly inaccurate I sent it back the more dense the wood the more in accurate they got in my case , my nephew is a superintendent for a large commercial historic building restoration company here in Chicago they manufacture matching moulding material they have all the test equipment for moister content , he tested 2 of my staves they came up with in .008 % of the numbers I got