Dwyer Visi-Float Series VFA Flowmeter, 2" Scale, Range 10-100 LPM Air, with Brass Valve, 1/8" Female NPT Process Connection 2" scale flowmeter with 1/8" female NPT connections for inline monitoring and measuring air flow Accuracy of + or  5% of full scale Precision machined from solid acrylic plastic to resist breakage and provide a clear view of the scale Black scale graduations are hot-stamped into the plastic for distinct readings Lightweight flowmeter has a metal mounting insert for panel mounting and can also be supported directly by system piping