Air balancing and energy audits are faster and easier with the CFM-Electronic Flowhood. It offers unequaled accuracy, direct digital readout, and density-corrected airflow measurement. No Ak correction factors are needed. Reads 20 to 25,000 cfm or liters per second. Comes with five tops and a carrying case. Custom tops are available. Is NIST-traceable. — Shortridge Instruments, Inc.