Smartphones offer so much computing and communication power that a host of applications have been developed to make use of them in the most unexpected ways. Such is the case with Sensorexa sensor manufacturer, has developed the PH-1 probe for direct connection to the iPhone, which, as its name suggests, is designed for pH measurement. Sensorex The pH value (directly or in millivolts), ambient temperature and solution temperature can be read off the display. It can also be dated. Measurement results can be grouped according to location or chronologically, and emailed as Excel (.csv) files.