Apera Instruments pH Calibration Solution 4.01/7.00/10.01 Each 250 ml, Buffer Set

pH 4, 00, pH 7, 00 and pH 10, 01 each 250 ml Precise calibration: the accuracy of pH 0.015 allows for the most accurate calibration Easy recognition: the colours show you the right solution at a glance (pH4: red; pH7: green) Use immediately: instead of dissolving powder in distilled water, you can use this solution immediately Long shelf life: up to 3 years shelf life.