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Differential Pressure Test Gauges Mid-West Instruments has engineered a series of differential pressure Differential pressures in tenths (0.0 psi). Function prompts shown in display. Two SS transducers (pressure sensors). Proof Pressure: 500 psi Burst pressure: 1250 psi Operating Pressure: 0 to 250 psi Temperature: 35 - 250 and differential pressure ranges.