The front cover is stainless steel (corrosion resistance is 304)High temperature resistance, chemical resistance, oil resistance, waterproof and dustproof grade IP67The meter comes with an alarm signal and does not require an additional alarm signal from the sensor.High brightness LED for backlight, high brightness and Name:52mm Universal VoltmeterFixing dimension: 52mm(2inch)Indicating Range: 18-16VWorking Voltage: 12V/24Vcolour: blackMaterial: stainless steelPackage Contents:1 x Voltmeter1 x Multi-plug socket1 x Chinese and English InstructionOnly 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.