Been milling for 3 years and have never owned a moisture meter. On a project now that I want to know the moisture level of my Ash as I'm sawing it so I know where I'm starting. Each log will be different I think. Is there a handheld moisture meter that is decent? I'm assuming I want a pin type? I see them from $40- $300. Can I get the info I want with a $40 unit? Do you need to indicate the wood species with hand held meters? I've got a woodcraft and Rockler near me or I can order a meter online. Thanks for your advice.
The pin meter or the common pinless meter cannot measure accurately above 30% MC.
Delmhorst J2000 accurate to 40%. They make an X version that is supposed to be accurate to 60%.
Forget $40 and think $400. Add more for X version. Very nice units though. Love mine.
If you get the Delmhorst J2000X be sure to get the slide hammer. You are looking at about $550. Worth it if you fool with a lot of wood. You have to set the species and temperature.
I run a Delmhorst boxed unit with the large slide hammer which can handle up to 3" insulated pins, handy for logs and timbers. Much above fiber saturation point and any of these are less and less accurate and weight is the way to go.
The reason pin meters (they measure resistance and not moisture content) do not work above 30% MC with accuracy is not related to the meter or it's construction, but is because the resistance of wood no longer is a reliable, single value correlation to MC. That is, the same resistance can be two widely different MCs; or two widely different MCs can have the same resistance. It might help to visualize that above 30% MC that there is liquid water in the wood in the hollow spaces of the cells. This liquid, small or large (31% MC or 130% MC), essentially creates a short circuit when measuring resistance.
A similar scenario exists for the common pinless meter...a poor correlation between reactance and MC above 30% MC.
Not to be argumentative, but does this mean Delmhorst is being overly optimistic at best, or deceitful and worst when the advertise accuracy to 40% on the 2000 model and 60% on the X model?
Or, is it just a matter that it's LESS accurate at those levels, but still a good approximation of actual MC?
Thanks Gene.
One can measure MC above 30% but the accuracy above 30% is not the "within 1/2% MC" that is present under 30% MC, which we obtain when temperature and species adjustments are made.
Again, not to be argumentative, is 1/2% really enough to be considered "not accurate enough"? I realize some problematic species require strict/stringent schedules, yet I'd think that simply making a slight correction for the 1/2% variance would suffice.
Thoughts?
Indeed, 1/2% MC when under 30% MC is ok for most or maybe all people. However, the initial question was about 40% and 60% MC readings. The error can be 10% or 20% MC or more at times.
Back to my original question.... I don't care if it's not accurate above 30% because I'll just consider that "wet". For my current project I need to know when my Ash is in the 12%-15% range as it will be used in a barn in ambient conditions. At that moisture content, it shouldn't move much after that hopefully. It would also be nice to measure wood stored in my dry heated shop down to 6%. After I've air dried it and then I'll bring it inside and measure over a number of months to know when it's low enough to use. It' for my own use, not a business. I was hoping a $40 or so meter would be good enough to tell me what I want to know. If so I was hoping for a recommendation. This is what I need input on.
I bought a $30 moisture meter from a big box store. It was garbage. I could have used my Ohm meter (Digital DVM) and done better.
I could do better by feel with my hands.
Then I bought a $120 moisture meter, it was as unreliable as the $30 one. So I did the only reasonable thing and bought a second just like it. ::). Both read differently, and I ended throwing them both into the garbage can.
Then I bought a Delmorst off Amazon. Been buying them ever since.
If you get a cheap one, keep the receipt.
Good words of wisdom for sure. It's kinda like this: either buy a good one, or use an oven and weigh it. Other than that, it's gambling.
I have two good pinless and a good pin meter. Don't regret the expenditure on any of them. The Delmhort J2000 with the long pins hammer, is the most accurate one of mine.
Brad,
With all the wood that you are handling, especially the beams, the J2000 with the long pins and the slide hammer would be just right. Outside you budget, though.
will last for decades, so although expensive initially, it is worth the price...longevity and accuracy.
Thanks everybody. WDH, I don't really care what the moisture content of the beams are. We timberframe green of course. Plus there will always be a gradient of moisture from the center to the outside. The only thing I care about it for is this 2x ash so I can know if it's at ambient and therefore will not shrink or grow significantly. 5/4 boards are the other use, when I want to build a project and therefore want to know if the boards are dry enough.
I use this Wagner unit that I got from Wood-Mizer when I began sawing. The newer ones are digital.
(https://forestryforum.com/gallery/albums/userpics/20011/DSCN0201.JPG?easyrotate_cache=1437513342)
My original idea was to sell lumber and would probably need a moisture meter. Of course I decided early on to forget selling and concentrate on sawing. It does get used occasionally but the protective film is still on the meter face. ;D
Analog says experienced ;D
It says "old" :D.
Mine predates protective film :D
really though, knocking 2 sticks together, listening and feeling is more accurate than a cheap meter because you'll abandon reason and trust the reading even when all your senses are telling you the meter is lying.
Going back to what PA was saying. We use a ~$100 digital scale with a 40 lb capacity for the farmers market that passes some pretty tight testing from the state every year. I have used it to test that we got dried medicinals to buyer specs. That wouldn't be good for fast checks though.