WH31 monitor the Temp & Humidity only, and supports 8 channel (You can add WH31 maxum 8 units to work with one gateway).
WH32 indoor monitor the barometric pressure, Temp & Humidity, and supports one channel only. It's design for upgrade HP2550 and HP3500.
WH32 outdoor supports one channel only to connect console, for there are complex algorithm to calculate Feels Like, App Temp and Dew Point. It's design for upgrade WS6006, WS68 and WH40.
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