The Barrel Gauge is a reliable, swing arm type drum gauge used for measuring all types of liquid levels. It features clear butyrate sight tubes and a float indicator so with just a glance, you can check how much is left in your vertical drum. Gauge indicates gallons, liters, and volume percentages. The simple mechanical design promotes durability, minimal upkeep, quick installation, and easy/inexpensive repairs. Made specifically for standing drums. This model comes with plastic calibration, plastic locking nut, stainless steel rods, aluminum bushing and Nitrophyl float.