Anemometer, Testo 435-1 Multifunction instrument for measuring airflow using hot-wire or vane-type probes, humidity, or temperature using accessory thermocouple probes, with menu-driven operation, dual display and infra-red download to accessory printer with printout of results, date and time. Max. Ranges:- 0 to 40m/s, –60 to +400°C (dependent on probes selected), 0 to 100% R.H. Resolution:- 0.01m/s, 0.1°C and 0.1% R.H. Overall 225 x 74 x 46mm (L x W x D). Weight 0.45kg. Supplied with 4 x 1.5V AA batteries, calibration protocol and instructions. Without probes.