The Extech SDL350 is a versatile hot wire thermo-anemometer designed for precise measurement of air velocity, airflow (CFM), and temperature, with the added capability of standalone data logging. Its integrated SD card logger records measurements with date and time stamps directly in Excel® format, enabling easy transfer to a PC for detailed analysis without special software. For on‑the‑spot use, up to 99 readings can be stored and recalled manually.

The instrument features a large 9999‑count backlit LCD that simultaneously displays air velocity (or airflow) and temperature for clear, convenient reading. The hot wire probe extends to a maximum length of 4.9 ft (150 cm) via its cable, allowing access to hard‑to‑reach ducts and vents. For applications requiring high temperature measurement, the SDL350 includes a Type K/J thermocouple input, expanding its utility beyond standard anemometry.

Key operational features include a selectable data sampling rate from 1 to 3600 seconds, MIN/MAX recording and recall, Data Hold, and a programmable auto power off with disable function for extended logging sessions. A built‑in RS‑232 interface provides connectivity for real‑time data acquisition when needed.

The Extech SDL350 is an ideal tool for HVAC professionals, facility maintenance engineers, and environmental consultants who require reliable air velocity and temperature data combined with convenient, long‑term logging capabilities.

Features

• Hot wire anemometer with air velocity and CFM measurement
• SD card data logging (Excel format) with date/time stamp
• Manual store/recall of up to 99 readings
• Selectable sampling rate: 1 to 3600 seconds
• Type K/J thermocouple input for high temperature measurements
• Large 9999‑count LCD shows air velocity/flow and temperature simultaneously
• Telescopic probe extends up to 4.9 ft (150 cm) with cable
• MIN/MAX record/recall, Data Hold, auto power off (disableable)
• Built‑in RS‑232 interface