This portable professional measuring instrument features a large LCD display with backlight and multiple unit switching. It can be used for both handheld and stationary measurement. Includes functions such as data hold, maximum, and minimum reading display. Features a low-battery indicator. Specifications: Air speed: - m/s (meters/second): 0.80~30.0 (2.0% of reading + 50) - ft/min (feet/minute): 78~5900 (2.0% of reading + 5) - km/h (kilometers/hour): 1.4~108.0 (2.0% of reading + 50) - mph (miles/hour): 0.9~67.20 (2.0% of reading + 5) - knots: 0.8~58.0 (2.0% of reading + 50) - ft/s (feet/second): 1.30~98.50 (2.0% of reading + 50) Air volume: - CFM: 0~99990, 0~9.999 ft - CMM: 0~99990, 0~9.999 m - CMS: 0~9999, 0~9.999 m Features: Flow area setting, maximum/minimum function, backlight, automatic power off, low battery indicator Power supply: 9V 6F22 battery (not included) Dimensions: 17.20 x 8.80 x 4.50 cm (6.77 x 3.46 x 1.77 inches) Package includes: 1 x HYELEC MS6252A Multi-function Digital Anemometer, 1 x English Manual, 1 x Canvas Bag Note: Size is measured manually; slight variation may occur.