Solinst-Model 3001- Levelogger Junior LTC

Logs conductivity, as well as water level and temperature.

It combines a datalogger, 5-year battery, pressure transducer, and temperature and conductivity sensors within a small waterproof housing, 7/8" x 7.5" (22 mm x 190 mm). Memory is non-volatile and stores up to 16,000 sets of readings. Measurements are linear, in any interval between 5 seconds and 99 hours. The conductivity sensor is a 4-electrode platinum sensor, with auto-ranging capabilities.