Excellent app... Just be careful around big magnets! App works amazingly well for sensing weak magnetic fields, but my Galaxy s4 doesn't seem to have much of a tolerance for strong fields. I was trying to see how strong some subwoofer motors (the magnet part) I have are, but I couldn't measure anything higher than about 33 gauss/3.4 millitesla (or, about a foot away) before my screen would turn off. EDIT: Also, this thing is awesome for demagnetizing tools! Drill shavings don't stick to my calipers anymore! This is amazing.
Great app, usable for detecting current in wires, checking guitar pickups, R/C motors, how my Weller soldering iron is working... Regarding the compass...I'm pretty sure the compass display is intended for indicating field polarity, not for navigation. Anyway, I don't see any difference between this apps compass heading and the one in HandyGPS. I have the developer's accelerometer app also installed, same as this one it's free, noninvasive, and works great on my Galaxy S6 hardware.
This little app is nothing short of amazing. It truly works. If you don't believe me, give it a spin for yourself. I measured the electromagnetic field of my computer and other electronic devices in my house and then took it outside to measure the EM field of a high voltage power line close by. The closer you get to an EM field, the higher the reading. I was amazed at how much EM radiation my desktop computer emits when I place the phone within an inch of it. Parts of my house give out higher readings than the high voltage power pole outside. What an eye opener.
Saved me a headache I work in the oil field and was in a bind at midnight of course and needed a gauss meter to check the magnetism of some equipment. Praise Jesus King of glory! This app works better than the little hockey puck meters my company uses. Granted what I'm using it for simple z axis magnetics. But it saved my rear end.
@ last, a really working gauss/Tesla meter Tested lots of crap-apps intended to measure magnetics, this one does the job! Thank a lot ! BTW... Why it keeps nagging on my firewall, that it needs to connect to internet, scanning ports 2 connect Tesla's?
Seems to have the best options for calibration and the MOST number of Menu Features. How well the Hardware works is one question, IF this APP works perfectly (seems OK) then this APP gives more to fiddle with than the others. It remains to be seen if I can get a REPEATABLE result, currently the orientation seems to have more to do with the Display than anything; could be detecting the Earth's Magnetic Field for all I know (and thus it is too sensitive to find a wire or magnet).
Metal Detector is tool that uses magnetic sensor to find metal surrounding you.