Patapsco Mike said:
http://www.harborfreight.com/digital-mini-moisture-meter-67143.html
That's all you need. Any one will do.
It helps me. Sometimes I lose track of which wood was stacked when, and in the sun it all looks the same pretty quickly. I can usually figure it out, but I like making sure and sometimes there are real surprises. Some wood you can burn within just a few months. Other woods take years. Not everyone knows how much time each kind of wood takes to dry- I sure don't.
Wood burning is an acquired art, taking time. Too many here starting out want "correct" answers immediately; forget it. Most here are heating only a tiny delta: "up from" the central fossil furnace set at 65 F anyhow. :roll:
All of your tech tools-- a M² that only penetrates a few mm, an IR gun, digital monitors, video probes, cat probes, spreadsheets on readings, etc, etc...--will never give you those "correct answers" you want. Get a simple stove thermometer, watch it to the manufacturer's specs, don't drop the fire too soon, then enjoy. That's what it's all about. Take the time to enjoy your wood burner and the fuel. Step back a lurk around your woodpiles. Learn over a short time ( no PhD in wood burning necessary) to discover when your splits are ready. Color (colour), weight, end checking, sound of banging two splits together, and the noise in the fire: sizzling and bubbling, then you know it may be wet or unseasoned, or........just burn it until the sizzling ceases. Been done without all those pricey tools for decades.
Best tool you can have ? Build a real woodshed: easy, cheap, practical. And a place for you to lurk with your fav beverage, admiring the hours of felling, skidding, hauling, humping, splitting.
Now, if you simply enjoy monitors, recording readings, doing analysis, fine. Diddle away. For many of us with too much to do, we harvest or scrounge ( rarely buy ) the fuel, work it up, split and stack, shove into our appliances , then love the warmth. Period. Now the flames...............