With two redundant probes you can calculate the average between the values (very useful in the case of tanks larger than 300 litres with different temperature zones) and notice calibration problems of one of the two probes.
Moreover, each probe will be provided with a calibration coefficient to set in your AquaStation, so that the measure will be more accurate.
The probes have a resolution of 0.001 ° C and an accuracy of 0.2 ° C.
This module requires a AquaStation Base to run correctly.