DANOPLUS Smart Water Quality Tester, 24 hrs Wireless App Monitoring of pH EC TDS Salinity SG Temperature, Mountable with Alarm Function for Aquariums & Hydroponics

DANOPLUS Smart Water Quality Tester, 24 hrs Wireless App Monitoring of pH EC TDS Salinity SG Temperature, Mountable with Alarm Function for Aquariums & Hydroponics

BOJACK 15 Pack of pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 4.01pH,6.86pH and 9.18pH

General Hydroponics pH Control Kit For A Balanced Nutrient Solution