This single channel temperature instrument for monitoring water temperature includes an analog output for data acquisition, and with an optional temperature control set you can regulate water temperature in fish tanks, aquaria etc.

This refrigerated/heated circulating bath has a cooling capacity of 240 W and includes a powerful pump and a digital thermostat for accurate control of liquid temperatures in the lab. Use it with anti-freeze liquid like glycol for keeping sea water at sub zero temperatures, e.g. for polar biology.