General Hydroponics Calibration Solutions

General Hydroponics pH 4.01 Calibration Solution 8 oz

pH 4.01 Meter Calibration Solution General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each...

General Hydroponics pH 7.0 Calibration Solution 8 oz

pH 7.0 Meter Calibration Solution General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each...

General Hydroponics 1500 PPM Calibration Solution 8 oz

1500 PPM Meter Calibration Solution General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each...