It is a digital multimeter voltage signal indicator, high brightness LED display and cylindrical main body. The meter can only be used to measure AC electricity. It can be used as an indicator signal, warning signal, accident signal and other signals in the power line, telecommunication, machine tool, ship, textile, printing and mining machinery. Display: voltage Measuring voltage range: 12-500V AC Size Chart: Size: Approx. 29x51x20mm / 1.14x2.00x0.78inch Package Includes: 2 Pieces Blue Voltage Voltmeter Meter 1 Piece WhiteVoltage Voltmeter Meter 1 Piece Yellow Voltage Voltmeter Meter 1 Piece Green Voltage Voltmeter Meter 1 Piece Red Voltage Voltmeter Meter Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.