* Wide applications: use to check air conditioning & heating systems , measure air velocity, wind speed, direction, temperature, etc. * Multifunctional. the measurement unit can be selected according to different requirements. * Maximum value data hold function. * DATA HOLD function for storing 24 groups of datas. * Low-friction ball-bearing design allows free vane movement. * Separate type design, convenient to measure. * Automatic Power off, 0-9 minutes set by users. * Use “USB data output” and “RS-232 data output” to connect with PC. * Provide “Bluetooth ™ data output” choice.