Matl clear polycarbonate; scale measure in 5 degrees lined increments; word "climb" at 15 deg; number "30" at 30 deg; number "60" at 60 deg; word "dive" at m15 deg; number "30" at m30 deg; number "60" at m60 deg; large dot at p90 degrees and m90 deg; 2.500 in. O/a dia
