Open a 2inch dimension and 2-1/5inch depth hole, put gauge into it and fastenMade of high-quality 316 stainless steel compatible with long-term use even in acidase, humid environmentA 3-in-1 multi-function digital meter integrating Water Temp Gauge, Water Level Gauge, and VoltmeterThe instrument has its own alarm signal, and no need additional alarm signal by the sensor.High brightness LED backlight, high brightness and long life.Water Temperature: 40-120 (Temperature sensor: 301-22ohm)Water Level: 0-100% (Level sensor: 0-190ohm/240-33ohm available)Voltmeter: 9-32VAlarm: Symbal flashing(When 2 or more faults occur, an item is reported every 3s.)Degree of Protection: IP67Backlight: TFT ScreenDimensions: 52mm diameter (2inch); 55mm Depth (2-3/4inch)colour: whiteMaterial: stainless steelPackage Contents:1 x 3 in 1 Multifunction 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.