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Moisture meter comparison8/15
I've had a Lignomat pin meter for a couple of years. I like it but wanted something more convenient and non-invasive. Recently I purchased a Lignomat SDM. I also like it. Problem is, when I use the two meters on the same piece of lumber, the pinless meter always indicates about 2% higher MC than the pin meter. What gives? (I've read as much as I can find on the two types, including the discussions here.) When looking for 7% MC, which meter should one rely on?
When measuring the MC with the pinless, do you have 1" stock and an air space underneath? Did you use the actual density of a table value. Sometimes the table values are off.
In most cases, the pin meter is most accurate, but how deep do you drive the pins? For the average of a piece, about 1/4 of the thickness. Sometimes the species calibration is off. Did you correct for temperature?
For the pinless model, I used the density value from the Forest Service pub.
The response from the manufacturer was that the pinned model would be more accurate. BUT...for the cabinet maker who wants to avoid holes in his finished product, the "less accurate" might be less desirable.
I'm beginning to think I need a calibration table for the pinless model.
PS: yes to the airspace question.