Calibration solution set pH 4.01 / 7.00 / 10.01

pH value: 4.01 / 7.00 / 10.01 per 250ml Precise calibration: Accuracy of pH 0.015 allows highly accurate calibration Easy recognition: Based on the colors, you can recognize the correct solution at a glance (pH 4: red, pH 7: green, pH 10: blue) Use immediately: Instead of dissolving powder in distilled water first, you can use this solution immediately Long durability Batch certificate available on the Internet more