Barrel GaugesBarrel gauges are used inside Digilube's lubricant tanks to monitor the fluid level. It gives a visual indication through a float system so operators can easily see how much lubricant is remaining. This helps prevent the tank from running dry and ensures timely refills to keep the lubrication system running efficiently. This barrel gauge comes in 3 different sizes depending on the size of your lubricant tank; 6, 12 and 65 gallon.