Dwyer Instruments 2302 Differential Pressure Gauge, Gauge Nominal Dial Size 3 1/2", Basic Gauge Case Material Metal, Differential Gauge Connection Type FNPT, Differential Gauge Connection Size 1/8", Gauge Connection Location Back and Side, Differential Pressure Range Units In WC, Differential Pressure Range Value -1 to 0 to 1, Gauge Accuracy /-2.00 Percent, Body Material Die Cast Aluminum, Gauge Primary Range Smallest Graduation 0.05, Gauge Operating Temp. Range 20 Degrees to 140 Degrees F, Dims: H-2" W-4" L-4", Blistered Packaging, Made in USA