The PCE-228 water analysis meter is an easy-to-use handheld device for measuring pH, mV and °C. With the PCE-228 water analysis meter, both temperature and pH values can be directly stored onto a SD card (in Excel format), or transferred to a PC through an RS-232 interface. An optional software and data cable for the PCE-228 water analysis meter are available as accessories to transfer data to a computer. Temperature compensation in the PCE-228 water analysis meter can be done manually or automatically by way of the temperature sensor which is included. The pH meter has three calibration points. The calibration can be done with the trimmer on the side of the device which is protected under a cover. With this combined device, the user can determine pH value, temperature or redox potency (ORP). For the latter measurement parameter, a redox electrode must be ordered separately from the PCE-228 water analysis meter. We recommend the ORP-14 electrode. The water analysis meter is powered by a 9V battery, which is included in the delivery contents.