Description: 【Input Voltage and Temperature】: This Mechanical Hour Meter Gauge for Engineering Vehicles operates on a DC voltage of 10-80V Ac 100V-250V. It can function in temperatures ranging from -10 degree to degree, making it suitable for various working conditions. 【Non Resettable】: The timer cannot be reset to zero, ensuring accurate tracking of equipment operation time. 【Sealed Design】: With its fully sealed design, this Professional Engine Hourmeter is dustproof, making it sturdy and reliable in different environments. 【Versatile Usage】: This industrial timer is designed to regulate the running time of engineering vehicles and equipment, promoting energy efficiency and effective resource utilization which extends equipment life span. It's suitable for engine generators, vehicles, tractors, boats, and other industrial equipment. 【Material】: Made from plastic material, this industrial timer offers highly accurate time measurement capabilities ensuring accuracy in time intervals. Specification: 6cmx3.6cmx2.4cm/2.36inchx1.42inchx0.94inch Package Includes: 1 Set Mechanical Hour Meter Gauge Note: Please allow slightly errors 1-2cm differences due to manual measurement.