Measurement accuracy: ±0.5% of full scale Width x depth x height: 57 x 42 x 202mm Wind speed calculation (sold separately requires pitot tube) Measurement range (m/s): 2 to 17.5 Resolution (m/s): 0.1 Measurement range (hPa): 0 to 2000 Resolution (hPa): 1 Power电源(v):1 x 9V层压电池(随附)