TDS Calibration Solution

How accurate is your meter? We recommend that you calibrate you EC and TDS meters regularly. General Hydroponics standard reference solution is for conductivity meters measuring 1500 ppm. Easy to use, just dip your electrode into a small amount of the buffer and adjust. Do not reuse solution.

General Hydroponics reference solutions are of the highest quality, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used.