I have a few different levels. Sometimes I just use a simple pocket level.
Slightly better than that is an angle finding level, that can be used to determine whether the back and lens are plumb, or to transfer movements from one standard to another, like on a Sinar or other camera with scales--
The best thing I have for this purpose is a Suunto Tandem clinometer compass, which is a fairly precise clinometer for measuring tilt angles or the angle of the focal plane, or a compass for measuring the swing angle. It turns just about any floppy wooden camera or no-frills monorail like a Gowland into a fairly precise instrument. You can usually find them at good prices second-hand on eBay from guys who have purchased them for installing satellite dishes.
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