A device for measuring thickness andor rate of thickness increase of a film comprises at least one piezoelectric element, and first and second electrodes in contact with the piezoelectric element. The engine may have electromechanically actuated cylinder valves. 0 wt %, a resin composition which includes one or more selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and an oxygen-containing inorganic metal compound has a good thermal stability, flow and processability, making it suitable for injection molding.