CaveSurvey
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Ryobi PhoneWorks Laser Distance Meter
Here's another potential device to support. The Ryobi PhoneWorks Laser Distance Meter ES1000 couples with an Android device via audio(!), so its protocol would need to be reverse engineered. Combined with built-in compass and inclinometer, it could provide a $70 all-in-one solution.
https://www.ryobitools.com/power-tools/products/details/644
Audio input sounds weird :) Beside the protocol implications you have to open the sealed audio port on your device (if it is waterproof). Do you know if you actually see the laser or you have to point with the camera? Anyway for it's price it is worth trying, Thanks!
https://www.ryobitools.com/power-tools/products/details/644 It seem the app can store temperature and read inclination but I can't find any info about the source, e.g. does the device has a sensors or it uses data from the phone.
no device found to test
Ivo Tachev has such device