Solinst

Solinst makes water level data loggers with absolute or vented (gauged) pressure sensors that also record water temperature; the LTC Levelogger Edge version adds conductivity.

HenSistemas offers the Levelogger® Edge 3001, a self-contained logger with infrared data transfer. It can be deployed on a simple wireline or on a direct read cable, which lets you communicate with the logger while it stays installed and logging.