I had some plates made at work. They are 60mm x 60mm x 10mm copper that is then tinned via electroplating. The electroplating is to stop a layer of copper oxide forming on the surface and acting as an insulator. Between each layer I have inserted a gasket made from a bicycle inner tube. The hole in the middle is 18mm and is the cavity in which the LM35 temperature sensor and an LM358 op-amp with appropriate resistors (270k / 27k) for setting the gain (1 + 270/27 = 11).
I tested it for waterproof and all went well.
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