The W-K Pendulum Clinometer is easy to use and invaluable for use in awkward locations. Features extended vernier with magnifier, which makes reading easy. The instrument incorporates a drum locking device which enables the operator to secure the indication of angle before the clinometer is removed from the surface. Range: +180° to 0° to -180°. Reads to 1 minute 30 seconds of Arc. Base: 14″ x 1½”. Height: 4½”. Weight: 2 lbs.