My Lidl meter safely released and not so safely attached to tube with double-sided sticky tape (aka ord tape folded back on itself!)- nope doesn't have magnetic strip (and I have not found my magnets or my velcro!).

I just eye-aligned up on the tube. accuracy appears to be .2-.4 degrees of where it should be but this is still only by rough comparison with the altitude data on my Palm software (which may need long/lat tweaking). Doing a full turn on the base will let you know if anything is out of alignment because theoretically if all is levelled correctly you should get the same reading all round a full rotation. Found I don't need to use its blue backlight anyway because our streetlights are so bright (even on 3rd floor) I can pretty well read the digits straight off! (Time to purchase an air-rife to shoot said lamps off!)[Does that trick i read about of shining bright torch on sensor actually work?]

This is a brill thread - thanks to all out there for helping us all get going on this!