The front cover is 316 stainless steel (corrosion resistance is better than 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 long lifeName:52mm Universal Water Level GaugeIndicating Range: E-1/2-FULLWorking Voltage: 9-32V(12V/24V)Colour:whiteMaterial:stainless steelSize:52mmPackage Contents:1 x Water Level Gauge1 x Multi-plug socket1 x Chinese and English manualOnly the above package content, other products are not included.Note: Light shooting 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.