Series 2420 from Orange Research presents flow values on a large direct-reading dial. They measure flows up to 30 gal/min. Unlike glass or plastic rotameters, these flow meters are constructed with aluminum or stainless steel bodies and operate at line pressures up to 1,500 psig. Switch and gauge-switch models are available with hermetically sealed reed switches that can be adjusted to close or open on either increasing or decreasing flow rates. Microprocessor-based flow transmitters can be provided for a choice of output signals.