I'm not at all familiar with that company that makes that combo 3 axis magnetometer / accelerometer. I've tested several cave survey compass/clinometers using the Honeywell and the PNI magnetometers. The last go round with Honeywell magnetometers (a prototype) seemed to indicate a temperature sensitivity that was causing the calibration to deteriorate with temperature variation. The PNI magnetometers never had this trouble. That is why the new version of the Disto X, went back to the PNI magnetometers.
I tested by using a modified non-magnetic Brunton tripod with a custom fixture(s) to hold the instrument (tested Disto X, DUSI and Shetland Attack Pony). I have a course set up in a small cave with markers on walls, floor and ceiling for targets, and I compared to Theodolite data shot on the same course. I use some of the markers for calibration also.
I had a survey course set up (about 15 station loop), but it was much harder come to conclusions from that data. I could get good closure from an instrument that couldn't produce consistent agreement in foresights and backsights.
Here is photo of tripod with the first prototype of the second generation Disto X on it.