This is my first post, so excuse me if this topic has been discussed before. I did try searching for it before posting.
I have had past personal experience using three different Alpha Labs TriField Natural EM Meter units (not owned by me) and was very impressed with the "sum" setting's ability to sense human presence. Just waving one's had across the sensing plane spiked the meter like crazy!
So, with excitement, I ordered my own unit, complete with an internal red LED light.
For some reason with my purchased unit, I barely get a reading, if any, when it's set on "sum" and I do the same hand waving described above. I logically thought I had a defective unit and sent it back to Alpha Labs. They returned it re-calibrated, but it performed in the same fashion. I told them of the other units I have used, and was told by their head tech what I had in hand were not as accurate as my new one. I can say the previous units were older...up to 5+ years.
How could have they sold so many past units that were so "inaccurate" or bad? And if what I experienced was supposed be a fluke, how come I came across three in a row?
The Alpha Labs web site claims that the unit can detect human presence behind walls. I don't know how this can be the case when the meter needle won't move with my hand being 1/8" away from the unit, let alone detect a human many feet away. How can you detect the presence of anything with no meter response?
Is there someone here who can relate to this issue. Can someone set me straight with any ignorance I may have? I would be very interested in your comments and experiences. I really expected my new unit to act like the past ones I have handled. At this point, it has become useless, keeping residence in my equipment bag for over a year with little use.
Edited by sdGH_Tech, 15 August 2008 - 02:54 PM.