Voltcraft pl 135 han hot wire anemometer voltcraft pl 135han use this voltcraft pl 135han anemometer to measure air temperature airflow velocity and volume flow rate via an external tethered telescopic hot wire sensor with thermistor the product is suited for all kinds of applications related to heating air conditioning and ventilation the readings are shown on the lc display when the product is connected to a computer the readings can be displayed as a graph and exported as a text docu