I use one for monitoring a humidor from Radio Shack.
It's about 20 bucks and very accurate, has the temperature
also, plus it keeps the high and low measurements of each
until you reset. You can put it in a sealed bag with moist salt
to check accuracy, should be running at 70% humidity.
I think he's asking about meters that read the moisture
content of the wood, not the amount of moisture in
the air. The former is a moisture meter, the latter
is a hygrometer.
There have been articles in most of the woodworking
magazines on moisture meters, types, range of meters,
accuracy etc. They come in "pinless" and "pins" - one
drives pins into the wood and uses the change in
resistance to moisture content relationship to give
DAGS on Wagner, Lingomat (or is it Lignomat?) for
info on two of the most common brands.
You assume that the wood in question has been in your posession long
enough to have stabilized to ambient conditions. In many cases, this is
not true; if one purchases lumber there is a chance that it has not been
dried to equilibrium moisture content -- this is when a moisture meter more
than pays for itself by potentially saving a project.
No, I don't have one yet; yes, I've been lucky so far, although I always
allow for movement.
Yes, I do assume good practice. That's why I said it was a choice.
Never have been able to change the MC of a board with a meter. Seldom found
much difference between any two boards in a pallet. Must be different up
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