Datataker DT85 series stand alone data logger, mains or battery powered, with 16-48 analogue inputs ( universal input type ), 12 digital I/O, MODbus and SDI-12 serial input, USB memory up to 512 MB ( 50 million readings ), Logging rates 25 Hz to 99 days. Unit has an internal memory of 5,000,000 readings. Serial, USB and ethernet connection, with web server. Hire per week