Very interesting.
I just read the manual and it works by temperature comparisons. That is, this device is a digital infrared thermometer which measure soil/ground temperatures related to royal, noble metals which absorb heat and get warmer than the surrounding soil environment.
It pocesses several laser beam patterns. What it does is that when pointed to a target, the infra red thermometer lens focus the energy colected onto a sensor. Then, this is translated into a voltage signal which is directly proportional to the received energy amount. This is all done by an internal microprocessor which displays values which guide the user to know the target's location and the depth it might be.
For caves, the opposite is performed, which gives a lower temperature then the average surrounding.
You turn the detector on , measure the temp in 4 directions, (N, S, E, W) and then with this computed value you start the search.
Although I find very plausible its working method, I have doubts it will work all the time, regarding different soil conditions, but I will try to see if my team member spends an afternoon testing the unit.
If if proves ok, it will be a good mate for my Mineoro, specially because this laser device is supposed to work better at night.
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