The Extech HD755 is a compact, high-resolution differential pressure manometer built for precise low-range pressure measurement. With 11 selectable units and a differential pressure range up to 13.85 in. H₂O, it doubles as both a low-range/high-resolution gauge and a differential pressure meter, making it a versatile tool for HVAC balancing, duct static pressure checks, filter monitoring, and containment verification on restoration jobs.

A built-in Zero function handles offset correction, while Max/Min recording with relative time stamp lets you capture and track readings over time. Data Hold freezes measurements for easy logging, and the built-in USB interface (with included software and cable) makes it simple to export data to a PC. Auto Power Off preserves battery life between readings.

Everything ships in a hard carrying case for jobsite durability, complete with a 9V battery, USB software cable, AC adaptor, connection hose, and a built-in stand for hands-free use.

Key Features

• Differential pressure up to 0 to 13.85 in. H₂O (0.5 psi)
• 11 selectable units of measure (psi, in. H₂O, mbar, kPa, mmHg, and more)
• Basic accuracy: ±0.3% full scale
• Max/Min recording with relative time stamp
• Zero function for offset correction
• Data Hold and Auto Power Off
• Built-in USB interface with included software
• Hard carrying case included

Included: HD755 meter, 9V battery, software with USB cable, AC adaptor, connection hose, built-in stand, hard carrying case

Specifications

General

• Pressure (bar) : 0.034 bar
• Pressure (bar) Basic Accuracy : ±0.3% full scale
• Pressure (bar) Max Resolution : 0.001 bar
• Pressure (cmH₂O) Basic Accuracy : ±0.3% full scale
• Pressure (cmH₂O) Max Resolution : 0.01 cmH₂O
• Pressure (ftH₂O) : 1.154 ftH₂O
• Pressure (ftH₂O) Basic Accuracy : ±0.3% full scale
• Pressure (ftH₂O) Max Resolution : 0.001 ftH₂O
• Pressure (inH₂O) : 13.85 inH₂O
• Pressure (inH₂O) Basic Accuracy : ±0.3% full scale
• Pressure (inH₂O) Max Resolution : 0.01 inH₂O
• Pressure (inHg) : 1.018 inHg
• Pressure (inHg) Basic Accuracy : ±0.3% full scale
• Pressure (inHg) Max Resolution : 0.001 inHg
• Pressure (kgcm²) : 0.035 kgcm²
• Pressure (kgcm²) Basic Accuracy : ±0.3% full scale
• Pressure (kgcm²) Max Resolution : 0.001 kgcm²
• Pressure (kPa) : 3.447 kPa
• Pressure (kPa) Basic Accuracy : ±0.3% full scale
• Pressure (kPa) Max Resolution : 0.001 kPa
• Pressure (mbar) : 34.47 mbar
• Pressure (mbar) Basic Accuracy : ±0.3% full scale
• Pressure (mbar) Max Resolution : 0.01 mbar
• Pressure (mmHg) : 25.86 mmHg
• Pressure (mmHg) Basic Accuracy : ±0.3% full scale
• Pressure (mmHg) Max Resolution : 0.01 mmHg
• Pressure (ozin²) : 8.00 ozin²
• Pressure (ozin²) Basic Accuracy : ±0.3% full scale
• Pressure (ozin²) Max Resolution : 0.01 ozin²
• Pressure (psi) : 0.5 psi
• Pressure (psi) Basic Accuracy : ±0.3% full scale
• Pressure (psi) Max Resolution : 0.001 psi
• Pressure [cmH₂O] : 2.59 cmH₂O

Additional Details

• Certifications : CE
• Dimensions : 8.2 × 2.9 × 1.9" (210 × 75 × 50 mm)
• Power : 1 × 9V battery
• Warranty : 3 years
• Weight : 9.8 oz (280 g)