The DICKEY-john Hall Effect Wheel sensor (466970014S1) is used for ground speed input for planter and application monitors by reading raised metal objects such as sprocket teeth or bolt heads. 

• Sensor can also be used for fan speed or shaft RPM inputs
• Has a short lead with a 3-pin Weather Pack connector, Adapters available for most applications
• Fits in a 1.25-inch hole with two plastic jam nuts for easy mounting 1" 16 threads /inch