This AAVM-8880 is a hot-wire thermo-anemometer, it is ideal for low air velocity and volume measurement. The slim plug-in telescopic hot wire probe extends from 0.3 to 1m (inc handle) has a probe sensor head 9mm and is ideal for grille hoods and diffusers. It is excellent for ventilation surveys, air conditioning, clean rooms, flow hoods, air balancing and environmental monitoring. USB interface for real time transfer of readings to a PC or Laptop.0.1 to 25m/sec x 0.01Measures air velocity in m/sec, ft/min, km/hr, knots or mphMeasures air volume in m3/min or f3/minMeasures temperature C or F58mm LCD display with backlight and function indicatorsData hold and min/max hold for airflow and temperatureLow battery indicatorAuto power off can be user disabledUSB interface for real time transfer of readings to a PC or laptopMean point (average) over displayed elapsed timeStandard " camera bush for tripod mounting2 year warrantySupplied with USB connection cable, software, hard carry case, telescopic probe, battery and AC/DC mains power adaptorNote; This Instrument operates on the basis of maintaining the sensor eliment at a constant 80C. Therfore the battery life is limited to approx 4 hours operation.