Key Instruments 2540A5L57PI Variable Area Flow Meter 1-10 GPM Water

The Key Instruments 2540A5L57PI is a precision variable area flow meter from the 2500 Series, designed for accurate measurement of liquid flow rates, specifically calibrated for water. This acrylic-bodied rotameter features a clear tube with a direct-reading scale, allowing easy visual monitoring of flow from 1 to 10 gallons per minute (GPM). It is ideal for applications in water treatment, chemical processing, laboratory setups, and industrial cooling systems where reliable, low-maintenance flow indication is required. Key features include 1-inch NPT connections for straightforward installation, high visibility float for precise readings, and robust construction that resists corrosion in water-based environments. Advantages over similar products include its cost-effectiveness, simplicity without needing power, and accuracy within ±5% full scale, making it superior to basic mechanical gauges in terms of readability and durability. However, it may not suit high-pressure or high-temperature applications beyond its ratings, and it's best for clean fluids to avoid float obstruction. This model appears new in original packaging, with no visible wear, and includes installation instructions. Overall, it's a versatile, user-friendly option for mid-range flow monitoring, offering better value than electronic alternatives for non-critical processes.