It’s the most economical choice of a reliable lab-grade benchtop pH meter. This instrument is an outstanding combination of advanced electronics design and sensor technology. Thank you for purchasing Apera Instruments PH700 Benchtop pH meter.Place the electrode in the pH = 10 buffer. Set the temperature at the solution's temperature. To standardize (base range), follow these steps: 1. For Use of the Fisher pH Meter in the Base Range You will need to calibrate two points: pH = 10 and pH = 7.The checker offers automatic calibration and buffer recognition, calibrated buffer tags, stability indicator, low battery indicator and selectable automatic shut off. The easy to use Checker is a real favourite with students and researchers due to its clear LCD display and long thin pH electrode.