Low Range/High Resolution Gauge or Differential Pressure. Features: Two models to choose from: HD700 (±2psi range) HD750 (±5psi range) 11 selectable units of measure Max/Min/Avg recording and Relative time stamp Data Hold and Auto power off functions Large LCD display with backlighting Zero function for offset correction or measurement Built-in USB (software and cable included) USB port includes software The Extech HD700 Series manometer is a handheld, low range/high resolution manometers capable of gauge or differential pressure measurements. The Extech HD700 manometer has a ±2psi range; the Extech HD750 manometer has a ±5psi range; and the extech HD755 has a ±0.5psi range. All units have a resolution of 0.001psi with an accuracy of ±0.3% FS. The Extech HD700 Series manometer features 11 selectable units of measure: psi, inH20, bar, mbar, kPa, inHg, mmHg, oz/in2, ftH20, cmH20, and kg/cm2. Both units have a large LCD display with backlighting. User friendly functions of the Extech HD700 Series manometer such as Max/Min/Avg recording, data hold, relative time stamp, and zero function for offset correction or measurement are included in the design. A built-in USB port (software and cable included) makes data transfer and analysis simple and efficient. Click here for product datasheet Specifications Specifications Range Resolution inH2O 55.40inH2O 0.01inH2O psi 2psi 0.001psi mbar 137.8mbar 0.1mbar kPa 13.78kPa 0.01kPa inHg 4.072inHg 0.001inHg mmHg 103.4mmHg 0.1mmHg ozin2 32ozin2 0.01ozin2 ftH2O 4.616ftH2O 0.001ftH2O cmH2O 140cmH2O 0.1cmH2O kgcm2 0.140kgcm2 0.001kgcm2 bar 0.137bar 0.001bar