Suitable for all pH pens and meters. This pH Calibration Kit includes one eight-ounce bottle each of pH buffer 4.01 and 7.01. These solutions are used to calibrate pH meters to assure they are accurate and working properly.
A two point calibration between 4.0 and 7.0 assures that your meter is accurate across the scale.
Size: 8 oz Bottle (ea.)
The properties of your pH meter’s membrane is constantly changing from normal use and aging — check it frequently!