Series 477AV Handheld Digital Manometer

The Series 477AV Handheld Digital Manometer is a versatile measuring instrument designed to accurately measure pressure, air velocity, and flow in various applications. With ±0.5% full-scale accuracy (at 60–78°F/15.6–25.6°C), it eliminates manual calculation errors by integrating built-in velocity and flow algorithms. The device features field-calibratable zero/span adjustments and a damping function to stabilize fluctuating readings, making it ideal for HVAC diagnostics, ductwork testing, and industrial airflow management.

Multi-Parameter Measurement:

Measures pressure (in w.c., psi, kPa, etc.), air velocity (fpm, m/s), and flow (cfm, m³/h).

Auto-calculates velocity/flow from pressure inputs, reducing field errors.

Accuracy & Stability:

±0.5% FS accuracy in optimal temperatures (60–78°F), ±1.5% in extended ranges (32–104°F).

±0.1% FS hysteresis for consistent readings across pressure cycles.

Field Calibration:

Adjustable zero/span values for on-site calibration without external tools.

Damping feature to smooth out transient pressure fluctuations.

Display & Units:

0.42"" 4-digit LCD with selectable units for pressure, velocity, and flow.

Supports 12+ pressure units (e.g., in Hg, mbar), 6 velocity units, and 3 flow units.

Portability & Power:

Lightweight design (10.2 oz/289 g) with 9V alkaline battery (user-replaceable).

Low-power mode for extended field use.