Check the listing for details. GLX-Probe-PH PH Probe Sensor for Hayward Sense and Dispense HL-CHEM AQL-CHEM. Condition: New. Listed at 368.99 USD. Features: 【Great Compatibility】The PH Probe fits for hayward sense and dispense model AQL-CHEM and AQL-CHEM-UPG. Also fit for hayward salt chlorine generator models AQR-PRO-SD and HPC-4-ACT-RC. It helps seamless integration with existing auto systems. 【PH Measurement】The probe replacement continuously monitors the water’s pH level by sensing the concentration of hydrogen ions in the water, providing accurate and reliable measurement of PH in pool water. 【Quick Response】The pH sensor automatically adjusts dosing for optimal water quality. Help maintain proper pH range for water safety and clarity .Features: 【Great Compatibility】The PH Probe fits for hayward sense and dispense model AQL-CHEM and AQL-CHEM-UPG. Also fit for hayward salt chlorine generator models AQR-PRO-SD and HPC-4-ACT-RC. It helps seamless integration with existing auto systems. 【PH Measurement】The probe replacement continuously monitors the water’s pH level by sensing the concentration of hydrogen ions in the water, providing accurate and reliable measurement of PH in pool water. 【Quick Response】The pH sensor automatically adjusts dosing for optimal water quality. Help maintain proper pH range for water safety and clarity .