The GF08-2131E Panel Mount Rotameter is a dependable variable area flowmeter engineered for precise fluid measurement and regulation. It features an integrated flow control valve equipped with a sturdy black knob, allowing operators to make accurate manual flow adjustments with ease. The transparent measurement tube houses a high-contrast red float, delivering clear and immediate visual flow indication. Specifically designed for secure panel mounting, this flowmeter seamlessly integrates into control panels for industrial, medical, water treatment, and laboratory applications. The graduated scale is calibrated in Liters per minute (L/min), offering a reliable and visible measurement range from 0.4 to 2 L/min.