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Attached is a drawing that shows you how to power multiple external sensors with (1) AC-SENS-1 Power Supply.
Please note that the AC-SENS-1 can supply 12VDC to a maximum load of 400mA.
The attached PDF file shows how data from a smart rain gauge (S-RGA-M002 and S-RGB-M002) is depicted versus how it's depicted when recorded with an RG3 or RG3-M stand-alone data logging rain gauge.