â·ÃÊͺ¶ÒÁÃÒ¤Ò testo 511 handy measuring instrument for absolutepressure incl. protection cap, batteries and calibration protocol Testo 511 Handy measuring instrument for absolutepressure incl. protection cap, batteries and calibration protocol testo 511 measures absolute pressure with an accuracy of +/-3 hPa. It is converted to barometric air pressure by entering on-site height above sea level. In addition, barometric elevation measurement between two points is also possible. Measures absolute pressure, e.g. for absolute pressure compensation in flow velocity measurements with a Pitot tube Calculation of barometric air pressure Barometric altitude measurement Accuracy +/-3 hPa Protective cap for safe storage Including wrist strap and belt holder Backlit display 8 switchable pressure units: hPa, mbar, Pa, mmH2O, mmHg, inH2O, inHg, psi Storage temperature -40 to +70 °C Operating temperature 0 to +50 °C Battery type 2 batteries Type AAA Battery life 200 h Weight 90 g Dimensions 119 x 46 x 25 mm Probe type Absolute pressure probe Meas. Range 300 to 1200 hPa Accuracy ±3.0 hPa Resolution 0.1 hPa Differential Pressure Meter Manometer Testo Testo 511 à¤Ã×èͧÇÑ´¤ÇÒÁ´Ñ¹ÅÁ