This inclinometer is a perfect match for my Orion XT8 telescope and provides accurate height measurements when searching for objects in the night sky. In combination with a setting circle based on the azimuth coordinates, I find objects very quickly. The magnetic base makes it easy to attach the inclinometer to a metal tube. The numbers are bright, even too bright for my needs. I like the auto shut off feature. It definitely saves battery life as I often forget to turn it off when looking at the night sky.