HT-9829Hot Wire Anemometer 1. with telescoping probe measure in HVAC ducts and 2.other small vents,extends up to 40ft/min HT-9829Hot Wire AnemometerThe Digital Anemometer with telescoping probe measure in HVAC ducts and other small vents,extends up to 40ft/minFeaturesSlim probe , ideal for grilles& diffusersLarge LCD display with backlight, reading the air velocity & temp at the same timeThermal ...