Can be used to calibrate Hanna, Myron L., Oakton, and other brands of pH meters.

Used to calibrate Hanna, Myron L., Oakton and other brands of pH meters.

Use to calibrate all meters that use the 1 EC to 500 ppm water standard (Adwa, Hanna, Oakton, Milwaukie). If your meter won't calibrate chances are you are using the wrong standard to calibrate it.

Contains: One (1) 4 oz. bottle pH 4 Calibration Solution, one (1) 4 oz. bottle pH 7 Calibration Solution, and one (1) 4 oz. bottle 1382PPM Calibration Solution.

For use with the 24-7 Nutrient Monitor.