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)%