How accurate is your meter? 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.
ALL General Hydroponics 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).
Available size: Quart (32 oz)