The HOBO Water Level Data Logger features high accuracy at a great price, and HOBO ease-of-use. It is ideal for recording water levels and temperatures in wells, streams, lakes, wetlands and tidal areas. The completely self-contained logger means there are no cumbersome vent tubes or desiccants to maintain. This HOBO Data Logger can also be used in air to record barometric pressure data for accurate compensation when needed. A HOBOware Software Kit and an optic USB Base Station are required for operation.