Quick note on electronics and silicone. If you like to use silicone as a water-proof agent and or encasement, make darn sure you use either "food-safe" or "aquarium" silicone for direct contact with any wires, PCB traces, component leads, etc.. Most gelling catalysts in Silicons are corrosive and over time may (read will) cause you sensors to degrade and or fail. Wally-word and Pet-Smart are two good sources. Personally I prefer Epoxy (much more durable).
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