Capacitive sensors are able to detect what types of material?

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Capacitive sensing works by measuring how a material in or near the sensing field changes the electrical capacitance between two plates. Any material that alters the field due to its dielectric properties or conductivity will change that capacitance, so the sensor can detect a wide range of materials—from liquids and powders to solids, metals, and non-metals. Because of this broad sensitivity, it isn’t restricted to one type of material; it can sense many different substances as long as they affect the field in the sensing zone. The other options imply the sensor only detects one kind of material, which isn’t true for capacitive sensors in practice.