[High precision] High accuracy in percent ( +/- 1 digit). The ground wire of the test end and the supply connector are the same. Fast update of around 500 / time.[Connection protection] With reverse polarity protection. If the plus and minus poles are interchanged, the LED display is not damaged.[Built-in shunt] The 10A voltage and current meter itself has a built-in shunt.[2 colors for differentiation] Display voltage and current in different colors at the same time, red for voltage, blue for current (the current is measured in the negative rail).[Wide range of applications] The DC voltage ammeter from has a practical connection option and a wide range of uses. It can be used, for example, to monitor rechargeable batteries, an adjustable DC supply or to change the voltage and current status of another device.colour: blackMaterial: plasticPackage Contents:2 x Voltmeter Ammeter ModuleOnly 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.