Extech HD350 Pitot Tube Anemometer + Differential Manometer

The HD350 is designed for professionals who need to measure airflow, velocity and differential pressure in HVAC, ductwork, ventilation, and air handling systems—especially in locations where space is tight or access is limited. It includes a pitot tube with long connection hoses for insertion into air ducts, allowing measurement of air velocity and volume (CFM/CMM) as well as ambient temperature. Simultaneously, it provides gauge or differential pressure measurement (range roughly ±0.725 psi) using its dual ports. The instrument features a large back-lit display, selectable measurement units for pressure, velocity and volume; offset zeroing for accuracy; Data Hold; Min/Max/Avg capture with elapsed-time stamping; and internal memory capable of storing up to 99 readings each for velocity, flow and pressure. A USB interface and supplied software enable data download and further analysis on a PC. The kit typically comes complete with the meter, pitot tube with hoses, 9 V battery, universal AC adaptor, USB cable and hard carry case. With its all-in-one capability to measure pressure differentials, airflow and temperature, the HD350 offers versatile field testing and logging in a single instrument.

Features

• Combined functions: measures differential (or gauge) pressure, air velocity, airflow (volume) and ambient temperature in one instrument.

• Differential pressure range of about ±0.7252 psi (≈±5000 Pa) with resolution of 0.0001 psi and accuracy ±0.3% Full Scale.

• Air velocity measurement range from ~1 m/s up to ~80 m/s (or ~200–15,700 ft/min) with resolution down to 0.01 m/s and accuracy about ±3% of reading.

• Air-flow (volume) measurement capability (in CFM or CMM) when duct dimensions are entered, enabling volume flow calculation.

• Internal memory for storing up to 99 readings each in pressure, velocity and flow modes (total up to ~297 readings) and store/recall functionality.

• USB interface with included software and cable for PC connection and data logging/export.

• Offset/Zero function to null the instrument prior to measurement, plus Data Hold, Min/Max/Avg recording with selectable elapsed-time stamping.

Includes

• Thermo-Anemometer/Manometer
• Pitot Tube with 2 X 33.5″ (85cm) Connection Hoses
• Windows Compatible Software with Cable
• Hard Carrying Case
• 1 x 9V Battery