Harris Model 55-2Ar/CD 70 5/8 in.-18 Compensated Flowmeter 5400614 The Model 55-2 flowmeter is designed to provide precise flow control in SCFH. It is compensated at 20 PSIG and calibrated for most common industrial gases. Provides accurate measurement of gas flow for gas-shielded arc welding and laboratory applications. This model features a sensitive needle valve for fingertip control and durable, easy-to-read, flow tube and cover. It is equipped with a tamper-proof, self-reseating pressure relief safety valve.