Mine is a “MMD7NP”. It is heartbreaking not to fully understand it’s principles of operation, the “How”. As an engineer myself, I have the ‘need to know’ of the theory behind the device to better understand from my ‘tech-street knowledge’ how to make the proper interpretation of its readings.
I replaced the battery and even bought a second just alike to compare readings.
My next step is to buy some similar cement blocks at my local supply to do a ‘lab mock-up’ simulation test.
I take this meter with me to every inspection site, if there is a basement wall made of bricks, I tryout a few readings. It doesn’t seem to be conclusive. I can say all those walls are soaked in Water (98%+). I have thought of discontinuing it’s use. Most of this foundation walls seem very sturdy and have taken the ‘prof of time’ and are still standing. Do I need to make a big fuss to my clients to have them ‘further evaluate by a licensed engineering professional’? I have found that most of such licensed contractors are out to sell their internal French drain basement remediation solution no matter if there is a real need for such an investment.
These series of pics illustrate my confusion. The first one is taken on a rock slab. I set the mods to masonry and move over to the foundation wall. Up and down, left and right… reading is always very high. It may be misleading to conclude that the wall is soaked.
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