Dwyer A-SAH-44S is a Smart Air Hood® Balancing Instrument designed for air balancing in various environments. It can be powered by a 3.6V lithium-ion battery or four AA alkaline batteries. With a fast response time of 1 second and a high resolution of 1 CFM, it accurately measures air flow ranging from 40 to 2000 CFM. The instrument utilizes Wi-Fi direct low energy wireless technology and operates via the SMART Air Hood® application software. Made with durable polypropylene material, it provides reliable and precise airflow measurements. Accuracy is within ±3% of reading ±7 CFM for airflow greater than 40 CFM. Compatible units include CFM, m3/h, and l/s.