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What is the exact material of the sensors (including wires)?

The material of the sensor bodies is a robust hard plastic manufactured by injection molding. The sensors are encapsulated with epoxy resin, and there is a granular layer on top for better adhesion to the concrete. The moisture sensor measures between two stainless steel rings. The wires on the corrosion sensor mimic the rebar using S235JR+AR steel. Through various tests, this wire was chosen for its appropriate material properties and thicknesses.