Kimo Instruments' HM 100 pin moisture meter provides accurate humidity percentage calculation.
For measuring the moisture content of:-
Hardwood:8-78.5%
Softwood:10-93.7%
Plaster:1-2.5%
Bricks and concrete:0-22.9%
Resolution 0.1%
Accuracy +/- 1,0 %
Hold, Min/Max
calibration certificate