Loggers are not rated for direct immersion into any liquid. Only the stainless steel tip of the external sensor is suitable for immersion. A waterproof enclosure is available for some models. TREX, TRED and TREL models are fitted with an External Sensor.

We also recommend to hang your Logger vertically using the lug hole. This will allow any water or moisture to drain out of the unit. 

For more specific information, check your user guide on the logger's product page for the IP rating.