Model 142 differential pressure gauges use a diaphragm to provide complete high to low side isolation for zero leakage. They extend differential pressure range down to 0 to 20 in. water with improved accuracy below 0 to 400 in. water. Maximum range is 25 psid, and has a working pressure of 3000 psi for aluminum and stainless steel and 1500 psi for brass. Gauges are available in 21/2, 31/2, and 41/2 in. dials.
Mid-West Instrument, (586) 254-6500, www.midwestinstrument.com