Features Dual LED display - AC 80-500V LED dual display of AC voltage and frequency at the same time. Application - The meter only fits 45-60Hz pure AC power supply, should not be used for square wave, inverter output. Simple Operation No need power supply, two wires connect directly with AC 80-500V, then you can finish the test. Clear Data - The data is more intuitive, two-color, red and green LED display, clear and easy to monitor at a glance. Easy Installation - Easy to install, built-in buckle installation, more stable. Specification: Condition: 100% Brand New Product Model: YB4835VF Material: plastic. Color: white, black (optional) Weight: about 70g/2.5oz. Display mode: 0.39 inch LED, Voltage: red word, frequency: green word Measurement accuracy: 1% (± 2words) Test rate: 2 times/sec Frequency measurement range: 45.0 - 60.0 Hz Minimum resolution: 0.1 Hz Voltage measuring range: AC80-500V Minimum resolution: 1V Package list: 1 x Voltage Frequency Meter Package List