The RZ Series Hour Meter runs without electrical connection. The RZ Hour Meter records the running time of components, such as machines and vehicles that vibrate during operation. The automatic mechanism in these meters convert vibrations into energy, which drives the hour meter and minute sweep hand. These meters have a high-sensitivity level, capable of operating from the slight vibration of a moving car. All RZ Series Hour Meters can withstand an IP20 Environmental Rating (IP54 with use of gasket).