A portable pH-Meter PCE-228 (pH / mV / °C / °F) and a magnetic stirrer PCE-MSR 100. The pH meter has local SD card storage and the facility to transfer data to a computer. The magnetic stirrer is ideal for optimally mixing fluids, consisting of various components, with the most different number of revolutions and guaranteeing excellent results. The whisking can be done in both open and closed containers.