The portable HD2103.1 and HD2103.2 model instruments have a large LCD display. They are used in air conditioning, ventilation, heating, and environmental comfort. They are used in order to measure air speed, temperature and flowrate that are present inside pipelines and vents through the means of a hot-wire or vane probe. To measure the temperature, immersion, penetration or air contact probes alone can be used. The temperature sensor will be from the Pt100 or Pt1000 series. The probe come fitted with the SICRAM module and factory memorized calibration settings have been fed already. HD2103.1 and HD2103.2 models are fitted with the RS232C serial port and are able to transfer acquired measurements in real time to a personal computer or a portable printer.