Reddit reviews Digital Handheld Manometer HVAC Air Vacuum/Gas Differential Pressure Gauge Meter Tester 11 Units with Backlight, ±13.78kPa ±2PSI, 1-2 Pipes Ventilation Air Condition System Measurement
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Measures air pressure of the single pipe or differential pressure of 2 pipes. Has 11 selectable units of measurement kPa, psi, kgfcm2, ozin2, bar, mbar, inHg, mmHg, inH2O, ftH2O, cmH2O.Best for measuring the ventilation and air condition systems. Widely used for gas measurement, calibration, and any troubleshooting of any gas pressure systems.Max / minimum / Average reading record functionLow battery display and Auto power off set up functionDifferential pressure measurement,Large LCD backlit dual display
Good enough. https://www.amazon.com/dp/B07K7HT3XJ/ref=cm_sw_r_cp_apa_i_9rjyDb546KG6G Unfortunately if you're looking for a accurate reading with a fair-weather tool you need to static tubes or what they call pitot tubes