We have 10 in stock.
For use with the Testo 510, 435, or other micro manometer digital manometers to measure velocity pressure (the difference between static pressure and total pressure) in ducts. All have a 5/16" OD tube with inch graduation marks on both sides. They come with an air-velocity slide chart and direct-reading flow chart. Comply with AMCA (Air Movement and Control Association) and ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) specifications.