With Isodaq Tadpole GSM GPRS Data Loggers, users can perform water and environmental monitoring and gain online access to precision measurements at remote sites, even under hostile conditions. Sealed-for-life battery-powered dataloggers store values in memory and transmit data at regular intervals or on alarm activation via GPRS to telemetry server. Available with either 2.5G or 3G GSM modems, 16-channel loggers connect to wide range of digital sensors including multi-parameter SDI-12 sensors.