H20 GAUGE (F16004) from Faria Beede is a Spun Silver Water Temp Gauge (100 - 250 degree F) measuring 2 inches. A temperature gauge works by transmitting a low-amperage current from the gauge's meter to the ground via a variable-resistance sending unit, with variations in pressure, temperature, and other factors, the resistance of the sending units increases or decreases. The amount of current permitted to flow through the sender to ground changes as the sender's resistance changes, and the meter deflects, indicating the temperature. Key Features: Scratch-Resistant Domed Lens Bezel made of stainless steel LEDs illuminate the Dial's Perimeter. Imperial and metric scales are both available. Premium quality material Ideal for replacement Product Specifications: Brand: Faria Beede Instruments Condition: Brandnew SKU: F16004 Weight: 0.26 LBS Gauge Type: Water Temperature Voltage - Input Range (Volts): 12/24 V Gauge Size: 2" Box Set: No Series: Spun Silver Box Dimensions: 4"H x 4"W x 5"L