Specification: Item Type: Digital Voltmeter Material: Plastic  Weight: Approx. 25g / 0.9oz Signal Source: Mains Power Generator Voltage Detection Range: Input Voltage: 90-450V, Resolution: 1V, Display Method: XXX, Accuracy: 1.5 Level (Decimal Voltage Is Calculated Using Rounding) Frequency Detection Range: 0-99Hz, Resolution: 0.1Hz, Display Method: XX:X, Accuracy: 2.5 Level Cumulative Operating Time: Cumulative Running Time Of The Generator With Power Outage Time Saved, 3 Digit Led Display With A Timing Range Of 999 Hours (In Hours) Display Method: 3 Digit Led Digital Display Wiring Method: Plug In Connection Installation Method: Snap Fastening Model: 91 3 Single Phase 3 Phase Operating Temperature: -25-70℃ Storage Temperature: -40-70℃ Humidity: (20-90)% Package List:1 x Digital Voltmeter Note:Do not insert or unplug the meter from the socket while it is powered on. The meter contains high voltage and should not be opened without authorization to avoid electric shock. Features Digital Voltmeter: It Features high measurement accuracy, good stability, intuitive readings, and strong anti interference capabilities, making it an ideal replacement for traditional pointer instruments. Function: The digital voltmeter is a digital instrument used for real time measurement and indication of AC voltage, frequency, and cumulative running time in electrical circuits such as generators. Plastic Material: Voltage Meter is made with anticorrosion plastic materials, ensuring long lifespan. Providing high reliability and performance. Easy Replacement: Easy to install, with stable performance and resistant to damage. Practical diesel generator accessories that make replacing old parts easy. Improved Efficiency: Regularly replacing parts can enhance the efficiency and lifespan of the machine, making it highly suitable for long term use.