Lino LN-5000 mini air 500pa differential pressure meter manometer gauge for air condition hvac is a low cost, diaphragm operated, differential pressure gauge in a miniature housing.It can be used in applications for measuring positive, negative, or differential pressure with an accuracy of 5%. Standard applications include monitoring filter status, duct static pressure, room pressure, fan or blower pressure, paint booths, dust collectors, and cabinet purging along with many others.