pH 7.0 Calibration Solution, 5 packets
Any pH meter needs to be calibrated periodically to measure pH accurately. This unique, easy-to-use packet contains 20ml of 7.0 pH calibration solution to calibrate your pH meter any place, any time. Each packet is good for one calibration (solution should not be reused once opened.) 7.0 pH solution is most commonly used for single-point pH meter calibration.