Product Description
477AV-7 Handheld Digital Manometer for HVAC Pressure, Flow & Velocity
The Series 477AV Handheld Digital Manometer – Model 477AV-7 is designed for technicians who need fast, accurate air diagnostics in HVAC systems, cleanrooms, and process environments. Built-in velocity and volumetric flow calculations eliminate manual conversions, reducing job time and minimizing reporting errors during commissioning and troubleshooting.
Engineered by Dwyer Instruments, the 477AV platform combines rugged aluminum construction with field-adjustable calibration features, making it ideal for demanding service calls and commissioning work.
Pressure, Velocity & Flow Measurement in One Instrument
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Pressure Range: 0–100 PSI
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Accuracy: ±0.5% FS (60–78°F)
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Velocity Units: fpm, fps, mph, m/s, knot
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Flow Units: cfm, m³/h, m³/s
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Pressure Units: in w.c., psi, Pa, mbar, mm Hg, kPa & more
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Data Storage: 40 readings with min / max / average
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Adjustable zero & span for field calibration
Rugged Handheld Construction for Job-Site Use
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Aluminum protective housing
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Large backlit LCD for mechanical rooms & ceilings
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Damping function for fluctuating duct readings
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Compact 10.2 oz portable design
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Dual barbed & compression fittings for tubing connections
HVAC & Airflow Testing Applications
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Duct static pressure measurement
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Air velocity surveys
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Volumetric airflow verification
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System diagnostics
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Commissioning & troubleshooting
Environmental & Electrical Specifications
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Service: Air & compatible gases
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Operating Temp: 0–140°F
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Compensated Range: 32–104°F
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Power: 9V alkaline battery
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Approvals: CE
