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Sorry Colin, I forgot what the digital protractors are. I spotted mine in the shop yesterday and thought doh !
Mine is probably 20 years old now and I have never been able to use it effectively. Arms are too wide and the battery is always dead.
I've had a 4 foot "Smart Level" for even longer and...
Can't even enjoy a float plane flight on a random lake for lack of insurance coverage.
Or the price of avgas,
or parts,
or maintenance,
or subscriptions,
or tie down/hangar fees
or.......
Yummy.
Does the lack of asking price indicate a zero price, aka free
or
Is it a case of if you have to ask you can't afford it ?
Certainly of interest.
They're a cool idea.
If it was rectangular then the base would have be square in two directions to be quick and easy to use.
Cylindrical doesn't have to be so as there are always two tangent points that are square to the base. Imagine if you will, you're standing looking at the leaning tower...