Digital PH Meter, 0.01 Resolution Pocket Size Water Quality Tester with ATC 0-14 pH Measurement Range for Household Drinking Water, Aquarium, Swimming Pools, Hydroponics

General Hydroponics pH Down Liquid Fertilizer, 1-Quart

General Hydroponics pH Up Liquid Fertilizer, 1-Quart

15-pack pH Meter Buffer Solution Powder For Precise and Easy PH Calibration, PH Calibration Powder Solution 6.86,4.01,9.18

General Hydroponics pH Control Kit

General Hydroponics CALiMAGic Quart

15-Pack pH Meter Buffer Solution Powder, Easy and Accurate, Make pH Calibration Solution 4.01, 6.86, and 9.18

General Hydroponics Rapid Rooter Replacement Plugs 50 count

General Hydroponics pH Control Kit

Professional TDS ppm Conductivity Meter - Quick and Easy EC TDS and Temperature Test Pen | 0-9999 ppm with ± 2% Accuracy | Perfect 3-in-1 Tester For Ro Water Aquarium Hydroponics Coffee Pool etc.