The Extech Heavy Duty Hot Wire Thermo-Anemometer 407123 makes use of a telescoping probe designed to fit into small openings and measures airflow down to 40ft/min. The telescoping probe is ideal for measuring in HVAC ducts and other small vents; it extends up to 4ft (1.22m) long. The 407123 has a super large 1.4" (36mm) dual LCD display. Functions include Min/Max readings and Data Hold.
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