Amazon.com: Bluelab CONTPH pH Controller with Monitoring and Dosing in Water Digital Meter for Hydroponic System and Indoor Plant Grow with Easy Calibration, 1, White : Everything Else
Bluelab CONTPRO Pro Controller for Fully Automated 24/7 Digital Monitor, Dosing, and Data Logging of Hydroponics Reservoir (Base Only, No Pump), includes pH, EC, and temperature probe
GroLine pH Dosing System HI981412 - Hanna Instruments
Agrowtek GrowControl MDX AgrowDose Mini Dosing Controller System With Single Peristaltic Pump & Temperature, pH, EC, ORP Sensors Complete Fertigation Systems & Nutrient pH Dosing Kits Fertigation Systems & Autodosers Garden Care