Testo 425 New Thermal Probe Anemometer 0560 4251 Air Speed Meter Anemograph Ventometer Introduction:       Testo 425 thermal anemometer with probe, incl. telescopic handle (max. 33 inches), battery and calibration document The compact testo 425 is an easy to use anemometer with attached thermal probe on a telescopic handle. Just enter the duct measurements directly into the testo 425 and volume flow measurements (cfm) are shown on the clear display. You can switch between flow and temperature readings easily. Timed and multi-point mean flow calculations allow easy flow analysis, volume accumulation estimates, and temperature variation monitoring. Min-Max values are one button simple, while the "Hold" function freezes the current readings in the display for easy data recording. •Flow, volume flow (cfm) and temperature measurements •Multi-point and timed mean calculations •Max-Min values make comparisons fast and easy •"Hold" button freezes readings •Clear backlit display •Auto Off •null •TopSafe provides water, dirt and impact protection Specification:          Storage temperature -40 to +185 °F               Operating temperature -4 to +122 °F               Battery type 9V battery               Battery life 20 hr               Weight 10 oz               Dimensions 7 x 2.5 x 1.6 in               Material/Housing ABS               Probe type NTC               Meas. range -4 to +160 °F               Accuracy ±0.9 °F (+32 to +140 °F)              ±1.3 °F (remaining range)               Resolution 0.1 °F               Probe type Thermo               Meas. Range 0 to +4000 fpm               Accuracy ±(6 fpm +5% of rdg.)               Resolution 2 fpm