Complete Hydroponics pH 4.01 Standard Buffered Solution for Calibration is used to adjust electronic pH meters. Ph 4.01 is very easy to use, just dip your electrode into a small amount of the buffer solution and adjust the meter until it reads 4.01.
Important! Do not reuse solution.
Complete Hydroponics Standard Buffered Solution for Calibration is compatible with all makes and models of pH pens and meters.
This standard reference solution is of the exceptional quality. pH 4.01 allows growers to calibrate many popular meter brands (NaCl scale or the 442 scale). Each batch is carefully tested and checked to ensure calibration precision and reliable readings every time.