5 Stars By fan-key Customer on 2014-10-20
All things are relative
I do NOT have a good way of verifying that the readings from this tool are "right." That being said, I have worked wood long enough to be able to do "reality checks." By comparing readings from wood in different conditions (same species, stored indoors, stored in a shed, stored outdoors, outdoors under cover, etc.) I could get useful ranges of what I was looking for in moisture content before weather treating.
I found that I used BOTH measuring systems all the time. The prongs were good at letting me know when the surface was dry enough to accept finish. The ball was good at letting me know if the interior had sponged up a lot of moisture that would keep coming up to mess up the surface readings.
The big payback for me on this was being able to predict whether the inside of a troublesome beam was hopelessly wet. The "Deep Sensing" in combination with some common sense suggested that one half of the beam was OK, but the other was not. Sure enough, when I got everything jacked up and cut out the likely bad section, it was hopeless... but the other section was still acceptably solid. Thanks to the meter readings I had everything prepared to replace that one chunk (would have been in trouble if my interpretation of the meter had been wrong!) and the job went as planned (how often does THAT happen!!)
FYI: the common sense I mentioned was to use some wood of known measurement and use that to figure out how deep a bad spot might be. For example, measure a 2x square that extends beyond the range of the meter head. Measure the target 4" thick beam directly from both sides. Measure the 4" thick beam with the 2x square over it from both sides of the 4" beam. If the measurements from each side are equal, moisture is pretty even inside the beam. If they are NOT the same, moisture is higher in one side of the beam than the other.
Is this meter "right?" I have no way to verify that.
But intelligent use of relative values should make this tool pay off. I saved the cost of the tool in one project. YMMV.
5 Stars By Paul da Plumma on 2014-10-14
this item is amazing. You know
Really folks, this item is amazing. You know, I went on line to search for something that I was not quite sure what range of equipment to get. I am a plumbing contractor yet I only specialize in Service and Repair in a smaller community and did not want to sink to much money into something that I might not use very much.
Well, needless to say, this thing is the bomb. And I haven't even found the necessity to use the wire attachment with the pins. But, knowing how good this device is, the attachment may be good for other applications for whom which the device was developed such as General Contractors or Cement contractors, etc.
While using this item on the job that encouraged me to purchase this unit, the apartment manager and I definitely agreed that any commercial roofing contractor should have "at least" this device. I was able to easily follow every roof leak on these huge high rise buildings with new roofing. I could follow and find all of the leaks where they did not pay certain attention to how water gets under caps, and penetrates even the best paint jobs. It gets underneath the paint and separates the paint between the old concrete because there was not enough attention paid to the humidity while applying the new material. This is something that is almost unavoidable in Hilo Hawaii when you have scaffolding strewn several floors and have a deadline to meet because of tenant notification, etc.
I have seen this in almost every building in Hilo through the last twenty five years. Even though I am getting off track of plumbing, you must carry a moisture meter and set a limit as to when you can and cannot apply your compound, or your guarantee will haunt you even when it's not Halloween.
Anyway, this is the best for a plumber of my magnitude and has now lead me to many leaks in walls since I have purchased it!
Thank you, Paul da Plumma
3 Stars By mardy on 2015-04-25
Good intro price, works well enough when you uinderstand the WME vs Relative humidity. Clearer instructions in this regard would
After getting used to the tester difference between WME and Relative humidity, it worked quickly and efficiently. This unit was about 1/2 price of others that I was considering. I was able to find a chart/graph online, showing the correlation between WME (wood moisture equivalent) and relative humidity. That was super helpful. this unit works best in the WME mode for exterior applications. I ordered the optional 5" probe accessory, but couldn't get that to work, also the "remote" pins only worked intermittently. Would otherwise give this tool 4 stars. All in all, glad I bought this unit anyway, I just use the probe pins directly on the tool.
5 Stars By James Braun on 2017-10-09
A great deal
I was able to purchase this from fan-key at a reduced price since it was returned item. It was in new condition with all original packaging. The unit works well and can detect moisture in walls just as expected. I will be using this a lot in rehabbing a house.
5 Stars By CDI Southwest on 2016-08-22
works as well as a professional tester
This worked just as well (was as accurate with the pin test) as the one a professional used. The ball works well without holes, and then when things get serious, I go in with the pins. Wish it did not shut off if not in use for 2 minutes, but then again, I've not used more than 1 (maybe two) batteries, and I've tested our house and garage multiple times. Well worth the money
4 Stars By Duran D. on 2014-02-03
get what you pay for
like the other reviews state, this unit does the job for non-professional uses. i have a furniture company and use this meter to check moisture content of the wood prior to construction. the pins bend if you are not careful(it comes with replacement pins which is nice) and the pinless application seems to give different readings on the same board. the only complaint i have is when using the pins on the end of the unit i have to hold the unit at a certain angle to get a reading. not sure if this is just my unit or a design flaw. overall for the price it is a good buy, but is not a high end unit for professionals.
5 Stars By 44Roger on 2017-09-03
It is slightly annoying to need to hold down the power button about ...
Works very well and does what is expected. It is slightly annoying to need to hold down the power button about 10 seconds to turn it on, as I may do a couple times on a job (Home Inspector). But I guess that is something I can live with. It is also quite bulky; other meters I have had were much smaller.
5 Stars By Gemma on 2017-08-04
... with MP905 deep wall moisture sensor and it works like a charm
Purchased along with MP905 deep wall moisture sensor and it works like a charm.
5 Stars By Fran M on 2013-01-20
General Tools MMD950 Pin & Pinless Deep Sensing Moisture Meter
It was difficult to find a reasonably priced pinless meter that would not damage materials. It seemed almost too sensitive, and it "went bonkers" in one place due to a nail; also at the edges of a s shower floor. Well, later we took caulk out of the perimeter of our shower and found moisture trapped there behind the caulk! So the beeping was actually due to water there. (We are now grouting that area so water won't be trapped!) My husband got to compare it with one from work and it was very similar. Tghe actual numbers aren't exact without using pins, from what I read, but over 80% is a concern. Oh, and the instructions seem very involved but they do make sense. It was already primed to read and little setup had to be done at all; but it's good to read it all just in case!
3 Stars By Alex R on 2016-08-23
Not to great
Hard to turn on, shut off by self after 2 min. I guess that why it was offer for less