A thick film polymer membrane switch (108) can be positioned within a seat belt buckle. The switch (108) can detect if the seat belt buckle is fastened or unfastened. In one approach, an apparatus includes a housing (102) having a cavity (105), an insertio...

A sensor (100) to measure a liquid (120), such as an urea solution. The sensor (100) includes a light source (132) operably coupled to a lumen (136) disposed in a liquid solution (120), the light source (132) configured to emit light and communicate the li...