â·ÃÊͺ¶ÒÁÃÒ¤Ò testo 512 pressure meter (0 to 20hPa) incl. battery and calibration protocol Testo 512 pressure meter (0 to 20hPa) incl. battery and calibration protocol Simultaneous display of flow and pressure value 8 switchable pressure units: kPa, hPa, Pa, mm H2O, mmHg, psi, inch H2O, inch Hg 2 flow units: m/s, fpm Built-in density compensation Display light Hold/Max/Min function Readings printout with date/time and min./max. values Storage temperature -10 to +70 °C Operating temperature 0 to +60 °C Battery type 9V block battery, 6F22 Battery life 120 h Weight 300 g Dimensions 202 x 57 x 42 mm Material/Housing ABS Probe type Pressure sensor integrated Meas. Range 0 to +20 hPa Accuracy 0.5% of fsv Resolution 0.01 hPa Differential Pressure Meter Manometer Testo Testo 512 à¤Ã×èͧÇÑ´¤ÇÒÁ´Ñ¹ÅÁ