How to measure very precisely an angle of an object with respect to the vertical

Hello
I whant to measure very precisely an angle of an object with respect to the vertical.
The preciion should be of the order of a half degree

Do you know a sensor for that ?
Is there an accelerometer accurate enough ?

Hi,

mic78000:
I whant to measure very precisely an angle of an object with respect to the vertical.

If you mean any old surface with respect to "the vertical" being gravity, then an accelerometer is the only way to do it.

If you are measuring with respect to some other vertical solid, then it'll depend on what mechanical arrangement you want... like this ? Digital Protractor

Yours,
TonyWilk

These work pretty well.