I have an older distoX2 and a new distoX2, and came to thinking about building a protective case.  Naturally the topics of zero reference points and end piece extensions has come to mind.  Rather belatedly I thought I would run a rudimentary test over a short ~250mm distance that I could measure with a steel ruler, just to check my understanding of the behaviour.

It was not as I expected, and I have not found an explanation in any of the documentation.  Maybe someone has similar experiences.

The newer distoX2 is not yet calibrated, and they both have differing hardware and firmware versions, so either or both may be the cause of the differences.  Perhaps a table is the best way to document what I have found.

Disto	Old	New
Hardware	1.0	1.1
Firmware	2.4	2.5
ID	2973	4036
End piece setting	0.012 m	0.060 m
Reference toggle cycle	End piece-front-tripod	Back-front-tripod
Comment	End piece extension reference option is available	End piece extension reference option is NOT available
End piece disto - ruler comparison	267 – 265 mm works as expected	N/A
Back disto - ruler comparison	N/A	253 – 312 mm end piece setting ignored, does not work as expected
Front disto - ruler comparison	132 – 131 mm	131 – 131 mm
Tripod disto - ruler comparison	245 – 243 mm	244 – 243 mm
Calibrated	Yes	Not yet
Apparent accuracy	1-2 mm	1 mm except with end piece

One explanation could be that the end piece zero reference is not available and any end piece setting will be ignored until the distoX2 has been calibrated.

I am hoping that is what the situation is, and it will be easy enough to test, once I get around to it.  It does seem a bit odd however, as I assume the calibration is all about directions, and not distances.

Thoughts?

Bruce