With capacitive sensors by Baumer you solve almost any application.

Capacitive sensors can detect metallic, non-metallic, transparent, opaque, liquid and solid, conductive and non-conductive substances reliably without the need for contact. They are thus well suited to detect a diverse objects or also bulk goods and liquids.

These "all-rounders" are available in a large number of different designs and versions, and can also be implemented in very flat and space-saving designs.