Really?? With confidence??
How can a $20.oo moisture meter be accurate in all types and densities of wood, in all temperatures, in all the variable conditions??
Never mind, I'll answer that myself... it can't, it flat can't be accurate. At best it can only tell you that the same exact piece of wood is relatively (not absolutely) dryer or wetter than it was last time you checked it. But it can't tell you what the moisture content is, or even what percentage of moisture has been lost or gained. They work by measuring electrical resistance between two points... unless you can calibrate the darn thing for wood's density, temperature, and lord-knows-what-else... well... weight would be a better indicator.
That's the truth of it guys... they ain't magic.
*