Moisture Meter Accuracy Test - Wagner vs General vs Dr. Meter
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- เผยแพร่เมื่อ 3 เม.ย. 2017
- Moisture Meter Accuracy Test - Wagner vs General vs Dr. Meter.
Amazon Links to These Units:
Wagner: www.amazon.com/s/ref=as_li_ss...
General Tools: www.amazon.com/General-Tools-...
Dr. Meter: www.amazon.com/Moisture-Dr-me...
We test three popular pinless moisture meters for accuracy by measuring how repeatable the moisture readings are and calculating the mean deviation, or the average result spread of the tests. We also test the device intelligence by seeing if they can differentiate surface moisture from internal moisture.
The devices tested are:
Wagner MMC 205
General Tools MMD5NP
Dr. Meter MD918 - แนวปฏิบัติและการใช้ชีวิต
![[TH] VCT Pacific Stage 2 - Playoffs Day 1 // GEN vs RRQ | TLN vs TS](http://i.ytimg.com/vi/JhkzKOhvOps/mqdefault.jpg)
This is not an accuracy test, it is a variability/repeatability test. Repeatability with an electronic device will typically be good. Accuracy (absolute level accuracy) is what is interesting. This test essentially tells me nothing about which meter is "better".
Awesome clarity for me. I was just about to buy one and now realized I could be chasing false surface moisture readings. thanks
Great job mate! Many thanks for the demonstration, I'll definitely recommend this video to all my carpenter mates.
+kometa0017 Thanks Kometa!
Thanks for a a great video! That was really informative and you addressed a lot of points that I was wondering. Well done.
+Jeff Hampton Thanks Jeff, I appreciate it! Enjoy your moisture reading!
Hey. I'm Quality Control at a lumber mill. I'm trying to learn about these digital moisture meter. This was very helpful. Thanks!
Great test for consistency and repeatably, however now very helpful to determine the accuracy of the devices.
Tough part about testing accuracy, one would need to find a meter that has been tested/calibrated 100% accurate and then use the 100% accurate meter as a control, right before (or after) each review meter is used to test the wood/material. Tricky part is finding a perfectly accurate/calibrated meter, if we can find a perfectly calibrated meter, then we could begin testing accuracy.
This would be a good case study for a professor to teach first year students the difference between *reliability* and *validity.* Here he is testing reliability, but it has no bearing on whether these are valid (accurate) readings.
I really appreciate the reminder about the difference between accuracy and precision! So many ways marketing likes to fool us. 😅
Is there one that you feel like would work best to measure moisture level on internal wood portion of sidewalls on a RV or 5th wheel?
Trying to determine if there is any damage that is not visible.
how do you know exactly what that woods moisture is, so you can know which one got it right ? ? I have seen other videos saying the dr. Meter model in this video is good.. I'm going to order one.. for houses.. I'm a realtor on day job and being able to check walls while showing houses will be a bonus feature until if and when buyers can do a home inspection.
If you put a piece of traditional paneling 1/8-3/16th thick in between the test wood and meter how much does it effect results if any?
Very helpful. The dr meter had a low variance and almost matched a unit 10 times its price.
Seems like they are all junk? How can get a the same reading from your hand as a piece of dry timber? How can they vary by 15% for the same piece of timber.?
I know this was a few years ago but if you can’t afford a Wagner the Dr. Wood would be the choice correct? I read reviews about it and the biggest complaint is the need to constantly calibrate it. Any thoughts? Thanks
Do all three meters utilize the same technology? Electromagnetic, conductivity, or resistance?
Do these devices self calibrate when you turn them on?
Is it possible that is where some of the deviation is coming from?
The MMC 220 humidity meter, apart from being much more expensive, is quite fast, you have to wait less for it to check the temperature and humidity, it also has a density selector and it is convenient that the measurements are made suspended in the air
Hej, can you help my with a english user manuel for the MD 918 ?
By chance, did you do the oven moisture check to verify the meters results?
The MD918 meter checks the relative humidity, after calibrating it, you have to wait a bit after turning it on for it to check the temperature, then select the type of wood and place it on the wood separated from other materials and wait for it to stabilize.
If not, the measure may be unsuccessful.
It is slow but quite reliable
Does the Wagner display in decimals? If not the deviation test would be like comparing apples and oranges.
The new Orion line of wood moisture meters displays a decimal. www.wagnermeters.com/moisture-meters/
Hi great that you are doing this , I don't think you have proved accuracy on either of these only consistancy, also it would be interesting to do the tests on various moisture content woods and even several types of wood , nevertheless thanks for doing what you have done so far
Brian Gilbert Thanks Brian, those are some good ideas to try. Thanks, and thank you for watching! Take care!
Why would it not be important to know the actual EMC of the test piece and compare it to each meters readings
in determining the accuracy of the meter. I am confused as I think all you are looking for is repeat ability of each meter not the accuracy of the reading. Please correct me if I am wrong.
Hi Pete, good question. The reason knowing the "actual" emc is not as important as repeatability is... Nobody knows what the "actual" emc is...we can test all day long and get different answers based on which device we use to measure the moisture content. I can tell you the test piece has reached emc because it has been in that environment for quite some time...enough to stabilize. Keep in mind, a piece of wood can (and most commonly) has much different moisture contents based on the season. For example, a piece of wood can have 7.0 in the winter and can be considered emc. That same wood can be 11 in the summer and still be considered to have reached emc because it's environment is also more moist. It doesn't matter what the number is since it's always changing and every device is tuned differently.
Thanks for the information.
I think the CAT scan is the best
Try on sealed wood. May read correct in to the wood and not the surface. Due to the sealer.
Jesus, I hung in for over FOUR minutes.....
This measures deviancy for consistency. Not accuracy at all.
Great test and I appreciate your methodology. So is the moisture content of the pine 10% (Wagner) or 8.5% (Dr. Meter)? That is quite a deviation. I am generally looking for moisture content at 9 or below, but if the Wagner is more accurate than the Dr. Meter, I might have problems with my finished product.
Hi Ed, I guess there's no way to be sure which unit read closer to the actual moisture content. I'm betting the Wagner was a little more sure of it's answers, but the doctor meter wasn't far off... and given the fact that the Dr. Meter is $250 less than the Wagner, you'd have to ask yourself if an extra 1% accuracy is worth it. Thank you for commenting! Have a good day Ed!
Ed Wedin reach for 12% and your fine
Ed Wedin you’re
The Lone Woodman there is a $250 difference in price?!
The Wagner meters can be checked against a calibration block to check if it is correct. Also you can oven dry wood to get the exact moisture content of a piece.
Dont get me wrong but I think quet missinforming video how do you know your fabules wagner is showing you the correct date? Fizically inpossible fist you to put the meter exaxly to the same plase Into the timber has small tubes you just not see it so small like a spange same plase a wall or air or water is just imosible for an acuret meter swow you a correct number less up to 2 digit or more acurate 2 digit dot and anoter 2 digit thats more likely acuret meter but did you calibrated? no so what we talking about
what did I just read
The wagner say 3 lbs. pressure is needed when testing
Hmm, your potato comments just made me think that a lathe would be a really easy way to peel a potato.
The scoring is of course unfair. Round the others to an integer then compare. Having zero variance by having less precision isn't a feature or a win.
clearly they are all useless. they are not reading the true dryness of the wood, only the surface. thanks for saving me the money