Dwyer DTFA FlowmeterDwyer Instruments’ Series DTFA Variable-Area Flowmeter for gases measures gas flowrates with +/-5 percent of full-scale accuracy. Aluminum construction ensures compatibility and the strength to withstand system pressures up to 3000 PSIG (200 bar). The flowmeter is available in either ¼-inch or ½-inch NPT connections. It comes pre-calibrated for horizontal in-line mounting. – dwyer-inst.com