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Amazon.com: PerfectPrime AR168, Professional Digital Air Pressure Meter & Manometer to Measure Gauge & Differential Pressure ±20.68kPa / ±3psi / ±83.02inH2O with 2 Probes : Industrial & Scientific
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Digital Manometer, Dual Port Air Pressure Meter Pressure Gauge HVAC Gas Tester, Differential Pressure Manometer with 5/16 Inches Diameter Pressure Port, Hti-Xintai: Amazon.com: Industrial & Scientific