Extech HD755 Differential Pressure Manometer (0.5psi)

The HD755 is designed for accurate measurement of low-range pressures, both as gauge and differential readings, making it ideal for HVAC diagnostics, clean-room environments, ventilation systems and other applications requiring fine resolution. It covers a full span of ±0.5 psi (approximately ±34.5 mbar) and allows selection from eleven different units of measure such as psi, in-H₂O, mmHg, mbar, kPa and more. The meter’s dual-input configuration accepts two tubing connections (P1 & P2) so it can display positive or negative differential pressure depending on which side is higher. With resolution down to 0.001 psi, it captures subtle pressure changes. On the user interface side, it incorporates functions such as Zero/Offset correction for baseline adjustment, Data Hold, Min/Max/Avg recording with elapsed-timer stamps, and a large back-lit LCD for visibility in the field. A built-in USB port allows connection to a PC for data acquisition with accompanying software. The unit is powered by a 9 V battery (with typical battery life ~125 hours) and housed in a rugged double-moulded casing with quick-disconnect hose fittings and barbed input ports. The included kit typically comprises connection hoses, AC adaptor, USB cable and a hard carry case—ready for professional deployment. Overall, the HD755 offers a combination of resolution, flexibility and durability paired with advanced features, making it a strong choice when precise low-range pressure measurement and logging capability are required.

Features

• Measurement range of ±0.500 psi (~±34.47 mbar) with high resolution (0.001 psi) for sensitive pressure differentials.

• Dual input ports (P1 and P2) for true differential measurement (and gauge mode when one input is open).

• Eleven selectable units of measure (including psi, inH₂O, mmHg, mbar, kPa, ftH₂O, etc.) for flexibility across regions and applications.

• Min/Max/Avg recording mode with elapsed-time stamps, enabling capture of trends and critical events in the field.

• Zero/Offset function to allow baseline or reference-point correction before measurements.

• Large back-lit LCD display with clear indicators for mode, units, elapsed time and record status—optimized for field visibility.

• USB PC interface with software support (included) for exporting readings to spreadsheets or performing data analysis.

Includes

• Differential Pressure Manometer
• 2 x Connection Hoses
• Windows Compatible Software with USB Cable
• Switching AC Adaptor
• Hard Carrying Case
• 1 x 9V Battery