Has anyone hacked a Multipurpose Sensor with an external temperature probe, to read water temp in a pool or hotub?
The Mimolite relay has an analog input you can program to correspond to a thermocouple input. Other zwave devices might have a similar analog input. I don’t think you would be able to hack a temp sensor as the thermometer is probably surface mounted to the pcb.
There are several sensors that work with SmartThings that have external probes. But the multisensor is not one of them. Also the fibaro Open/close controller can accept analog input. So devices exist, you don’t need to hack anything.