Dwyer MP-002 Mini-Photohelic® Differential Pressure Switch/Gauge is a versatile device suitable for air and non-combustible gases. It operates within a temperature range of 20 to 120°F with an accuracy of ±5% FS @ 70°F. It requires a power supply of 24 VDC / 24 VAC and has screw-type terminal connections. It features (2) SPDT relays and allows set point adjustment using push buttons. The device comes with standard accessories and has dimensions of 4-1/8" (104.78 mm) depth x 3-1/16" (77.79 mm) diameter.