The Model PH-1 Meter Application Accessory for the iPhone or iPod measures pH accurately, presents the data in an easy-to-read format and supports email transmission of critical readings. Users simply plug in the accessory into an iPhone or iPod and follow the on-screen instructions to download the free application. Users then connect the module to the sensor and the application provides a real-time display of pH, millivolts, ambient temperature and solution temperature. For industrial processes, the accessory is suitable for service in easy-to-reach locations where pH measurements are routinely performed or can be taken to other distant locations where fixed instruments are unnecessary or too costly. It also works with location-aware devices to log the coordinates where readings were taken for analysis and auditing purposes.