Dwyer A-SAH-12P is a Smart Air Hood® Balancing Instrument designed for air flow measurement and balancing. It features a 3.6 V NCR18650B MH12210 lithium ion battery or can be powered by (4) 1.5 V AA alkaline batteries. With a response time of 1 second and a resolution of 1 CFM (1.7 m³/h) (.5 l/s), it accurately measures and displays air flow in CFM, m3/h, and l/s. The instrument is made of durable polypropylene material and has a flow range of 40 to 2000 CFM (68 to 3398 m3/h) for supply and 80 to 2000 CFM (136 to 3398 m3/h) for exhaust. It utilizes Wi-Fi direct low energy wireless technology for connectivity and is compatible with the SMART Air Hood® application software. The accuracy for readings above 40 CFM is ±3% of reading ±7 CFM (11.9 m3/hr) (3.3 l/s).