This is a ship's inclinometer made by Moeller Instruments co. This was used on ships to show how much the ship was listing side to side in heavy seas. It is 10" in diameter and 2 1/2" tall. weight is 3 lbs. 7 oz. It appears to be working but the side markers will not stay up by themselves. There must be an adjustment but I can't see out how to get the bakelite case apart. If anyone knows I would appreciate your input. There is a locking screw on the bottom that holds the main pointer at 0 degrees. This is a salvaged piece and does have scratches and wear.