A great accessory for certain Honeywell thermostats - I use this with my PC8900 to easily measure and display the heat and cool discharge temperatures right from the thermostat control panel. With the PC8900 it can also display a warning indication if a call for heat or cool does not result in a rise or drop in discharge temperature (ie. if something is malfunctioning). Since I like to tinker with my own A/C system to check and improve efficiency I find it convenient to be able to read the discharge temperature at any time. This sensor is also used with other Honeywell products for other purposes, but I am not familiar with those applications so I can't comment.
Verified purchase: Yes | Condition: Pre-owned
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