Overview Product Description Lau 050998-01 Pitch Gauge measures the correct pitch and rotation direction of fan blades (propellers). Follow These 3 Steps to Measure Propeller Rotation and Pitch: Position the faceplate of the gauge on the blade of the fan. Place the foot of the wire body of the Pitch Gauge on the center section of the fan. The pointer gives a direct reading of the pitch in degrees, and the clockwise/counter-clockwise markings indicate the rotation. Cross Reference: 05099801 Product Videos Custom Field Product Reviews