The ESDL-30 data logger is designed to log data from any sensor with an SDI-12 digital interface. It can be programmed to measure from 5 seconds to 168 hours in a linear mode. All the measured data is stored together with the current date, time and battery voltage, in the internal non-volatile memory of the data logger. The ESDL-30 is a rugged data logger that operates in a wide temperature range, reliable in a stand-alone operation, power efficient and great compatibility with numerous telecommunication options. The data logger can perform a variety of measurement and control applications with accuracy and reliability.