It is digital voltage tester signal indicator, high brightness LED display and cylindrical main body.The meter can only use to measure AC electricity.It can be used as signal indication, warning signal, accident signal and other signals in the line of electric power, telecommunication, machine tool, ship, textile,printing and mining machinery.Material: plastic + metalcolor: BlueSpecification:Item: Digital Indicator Voltmeter & AmmeterVoltage: AC 50-500VCurrent: 0-100APanel size: 31x31mm/1.22x1.22inchMounting aperture:22mmPackage Contents:1 x Voltage & Current Indicator1 x Current TransformerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.