"RBR Virtuoso (single channel) data logger"@en . . "SDN:L22::TOOL1506" . "A single channel data logger for long deployments. The instrument is powered by CR123A 3V cells. Capable of sampling up to 1 Hz. Features a large data storage capacity allowing up to ~30 million readings, and fast download ability. Optional version with up to 6 Hz sampling. Depth rated up to 750 m (plastic) or 10,000 m (titanium)."@en . .