The Skin-pH-Meter® PH905 is a quick, easy and economical tool to specifically measure the pH on the skin surface or the scalp. The modern, high quality electronics of the probe allow for a very quick and reliable measurement while avoiding occlusion effects. The probe head is planar for measuring on the skin surface. Single and continuous measurements are possible. Regular calibration can easily be done by the user. This instrument is available for the C+K MPA-System, as a stand-alone device and as a wireless probe.