@Starrancher that is the angle gauge. This is my 10 inch dob. It is all manual. Setting circles and the angle gaugge get me on target. In Ohio dew/frost is the big enemy. Heat is the best way to combat it. All of my scopes and finders have dew heaters on then
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I thought that what it looked like . Just never seen one in that application before . 
@Starrancher , it works pretty well. I level it to the scope base and then put it on the scope. It gets me pretty close usually
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Hey if it works it works . I’ve seen them used to set knife sharpening angles .
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