Minitide
“The Valeport miniTIDE is a small Tide Recorder, designed for short-term underwater deployments, ideal for academic studies.
Fitted with a 0.01% temperature compensated piezo-resistive cell, the miniTIDE will record high accuracy pressure data for a period of one month at a 10-minute sampling interval, using a single alkaline C cell. It is available with a choice of pressure ranges, and with either 500m acetal or 6000m titanium housings.”