Testo 420

Differential pressure measurement, useful for checking filters in air conditioning and ventilation systems  Calculate flow velocity and volume flow using an optional pitot tube  Save measurement data for analysis and documentation  Match with a Testo CEC compliant air flow capture hood to measure volume flows at supplies and returns (0563 4200) Differential Pressure: Measuring range -0.480 to 0.480 InH₂O / -120 to 120 Pa 19.7 to 2756 fpm / 0.1 to 14 m/s Accuracy ±2 % of mv 0.002 InH₂O at 72 °F, 405 InH₂O / ±2 % of mv 0.5 Pa at 22 °C, 1013 hPa Resolution 0.001 InH₂O / 0.001 Pa 0.01 fpm / 0.01 m/s Reaction time 1 sec (t90) > Absolute Pressure Measuring range 280 to 440 InH₂O / 700 to 1100 hPa Accuracy ±1 InH₂O / ±3 hPa Resolution 0.1 InH₂O / 0.1 hPa Reaction time 1 sec > Dimensions 6 x 3 x 1 in. / 150 x 85 x 35 mm Operating temperature 23° to 122 °F / -5 to 50 °C EU-/EG-guidelines EU-guideline 2014/30/EU Battery type Alkaline, type AA Battery life 40 h Display size 3.5 Display function Dot matrix Display ligthing with illumination Interface Micro-USB Memory 2 GB (internal) Storage temperature -4° to 140 °F / -20 to 60 °C > Each Unit Includes Testo 420 differential pressure measuring instrument Batteries Certificate of calibration