Odalog is the Industry Leader in H2S monitoring and datalogging. CAS Dataloggers is the sole US Authorized distributor for the Odalog line of H2S & hazardous gas data loggers. The NEW Odalog G20 H2S datalogger features an Industry Leading 90 day deplyment sensor. We provide factory authorized sales, service and support for the full line of Odalog Gas detection instruments CAS Dataloggers is also your source for universal input, rugged dataTaker data loggers and 18 other brands of data loggers, data acquisitions systems, paperless recorders and temperature monitoring solutions.