Model 478-0 digital differential manometer can be used to measure positive, negative, or differential pressures from -60 to 60 inches water column (-150 to 150 mbar). The unit features selectable engineering units and a minimum/maximum function. The hold key freezes the current pressure measurement on the display. The manometer includes a zeroing button to null out any minor pressure differences. The backlight can be used to view the display in poorly lighted areas.
Dwyer Instruments Inc., P.O. Box 373, Michigan City, IN 46361; 800-872-9141 or 219-879-8000; 219-872-9057 (fax); email@example.com; www.dwyer-inst.com.