Always interesting with "height" measurement devices.
Many different principles can be used, and getting better and better !
When the Shadowbox came, I contacted them in order to hear about the accuracy (and what it was based on), but never got an answer.
Could be they just didnt care - or could be they did not know
I think the Xensr got them quite right at the Red Bull, as they seemed to match quite okay to what was seen, right ?
The absolute precision, and to know what circumstances can make it worse or better, is interesting.
I work in a calibration/verification lab daily, so very aware of why it is not that easy to explain the measurement uncertainty, as there are sooo many variables - and especially when handling huge accelerations like in a kitejump.
There are also a "normal distribution" error involved in almost every single case, which means the precision can be one range most of the time, and then way off a few times
Really interesting device though - looking forward to hear more