Testo 425 testo 425 compact thermal anemometer with fixed velocity probe incl. temperature measurement and telescope (max. 820 mm), battery and calibration protocol The compact testo 425 anemometer with permanently attached thermal flow probe (probe head Ø 7.5 mm) incl. telescopic handle. Volume flow is shown directly in the display. Accurate volume flow calculation thanks to easy input of duct area. In addition, it is also possible to switch to the current temperature reading. Timed and multi-point mean calculation provide information on mean volume flow, flow speed and temperature reading. Min/max values can also be shown in the display. The Hold function makes it possible to freeze current readings in the display. Temperature, flow and volume flow measurement Multi-point and timed mean calculation Max/min values Hold button to freeze readings Display light Auto Off function TopSafe, the indestructible protective case (optional) TopSafe, instrument protection against dirt and knocks Storage temperature -40 to +85 °C Operating temperature -20 to +50 °C Battery type 9V block battery, 6F22 Battery life 20 h Weight 285 g Dimensions 182 x 64 x 40 mm Material/Housing ABS Probe type NTC Meas. range -20 to +70 °C Accuracy ±0.5 °C (0 to +60 °C) ±0.7 °C (remaining range) Resolution 0.1 °C Probe type Thermo Meas. Range 0 to +20 m/s Accuracy ±(0.03 m/s +5% of mv) Resolution 0.01 m/s Anemometer Testo Testo 425 à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´»ÃÔÁÒµÃÅÁ à¤Ã×èͧÇÑ´ÍѵÃÒ¡ÒÃäËŠẺ Hotwire