Dwyer Instruments DTFO FlowmeterDwyer Instruments’ Series DTFO Variable-Area Flowmeter for liquids measures oil rates with +/-2 percent of full-scale accuracy. Durable metal construction of a rugged brass or stainless steel helps withstand system pressures of up to 3,000 PSIG (206.7 bar). The series is offered in a variety of ranges up to 30 GPM and is available in ¼-inch, ½-inch and 1-inch connections for multiple applications. It also comes calibrated for horizontal inline mounting. – dwyer-inst.com