The 2000 Series Magnehelic® differential pressure gauges provide an accurate, economical indication of positive, negative, or differential air pressure in HVAC applications and building automation systems, BAS. The pressure gauge includes a 4 in (10.2 cm) easy-to-read dial and a frictionless magnetic movement in a cast aluminum housing. The differential pressure gauge is resistant to shock, vibration, and overpressure. The Magnehelic® Gauge has both back and side connections, so that it may be either surface- or flush-mounted. Ranges are available from 0 in to 0.25 in W.C. up to 10'' W.C.