Check the listing for details. GLX-Probe-ORP Replacement for Hayward Sense and Dispense System. Condition: Used. Listed at 300.00 USD. The GLX-Probe-ORP Replacement for Hayward Sense and Dispense System is a testing kit designed for pool water testing and maintenance. Specifically created as a replacement for the Hayward Sense and Dispense System, this product allows pool owners to easily test their water quality and ensure optimal conditions for their pool or spa. With this testing kit, users can accurately measure various parameters such as pH levels, chlorine or bromine levels, and more to keep their water clean and safe for swimming.The GLX-Probe-ORP Replacement for Hayward Sense and Dispense System is a testing kit designed for pool water testing and maintenance. Specifically created as a replacement for the Hayward Sense and Dispense System, this product allows pool owners to easily test their water quality and ensure optimal conditions for their pool or spa. With this testing kit, users can accurately measure various parameters such as pH levels, chlorine or bromine levels, and more to keep their water clean and safe for swimming.