Product Description    Kit for carrying out measurements in ventilation ducts: the testo 440 air velocity and IAQ measuring instrument and the vane probe (Ø 16 mm) are safely stowed away in the case. So you can get down to work straight away      testo 440 - Air velocity and IAQ measuring instrument            Temperature - NTC               Measuring range     -40 to +150 °C           Accuracy     ±0.4 °C (-40 to -25.1 °C) ±0.3 °C (-25 to +74.9 °C) ±0.4 °C (+75 to +99.9 °C) ±0.5 % of mv (Remaining Range)           Resolution     0.1 °C                            Temperature - TC Type K (NiCr-Ni)               Measuring range     -200 to +1370 °C           Accuracy     ±(0.3 °C + 0.3 % of mv)           Resolution     0.1 °C                            General technical data               Weight     250 g           Dimensions     154 x 65 x 32 mm           Operating temperature     -20 to +50 °C           Product colour     black/orange           Connectable probes     1 x digital probe with cable or 1 x Temperature NTC TUC, 1 x digital Bluetooth probe or testo Smart Probe, 1 x Temperature TC Type K           Battery type     3 AA mignon 1.5 V(Not included package)           Battery life     12 h (typically vane measurement)           Interface     Bluetooth®; USB           Storage temperature     -20 to +50 °C               Vane probe (Ø 16 mm, digital) - wired                 Velocity / Volume flow               Measuring range     0.6 to 50 m/s           Accuracy     ±(0.2 m/s + 1 % of mv) (0.6 to 40 m/s) ±(0.2 m/s + 2 % of mv) (40.1 to 50 m/s)           Resolution     0.