Hydroinnova CRS-1000 User’s Guide introduces Q-DL-2100 data logger platform, which consists of microcontroller, real-time clock, analog input subsystem, analog output subsystem, digital input/output subsystem, redundant data storage, RS-232 interfaces, SDI-12 interfaces, regulated 5V and 12V outputs, relays, integrated temperature, humidity and pressure sensors, remote communications subsystem.