Dart Controls is now offering the most economical NEMA 4/4X rated speed sensor on the market.  Excellent for outdoor duty / wash down applications, the PU-R Series comes in a variety of outputs from 1 to 20 pulses/revolution.  These sensors are performance-matched for use with all Dart Digital Drives and Digital Accessories.  The PU-R uses a sealed stainless steel bearing from the areospace / medical industry and conformal coated electronics to protect the devices from the elements.  Easy to install with no alignment issues, the PU-R Series in OEM quantities may be purchased for less than $100!