DJ-HyRate 

The Hy Rate Plus™ LED Seed Sensor is the sensor of choice for all seed types regardless of size, shape and seeding rate. From larger seeds such as corn to small seeds like canola, the Hy Rate Plus accurately counts seeding population during planting, providing confidence that your row units are working properly and seeds are being placed for optimum yield potential. Accurately monitors seeding rates between 1–135 seeds/sec across multiple seed types for uncompromised accuracy. Ability to distinguish doubles, triples and quad seed drops to maintain accurate population count.

DJ-Hy Rate Plus John Deere "Flush Face" Seed Tubes. For use only in Cast Iron style shank found in XP series row units. Does not fit within stamped steel shank for Max Emerge, Max Emerge Plus or Pro.