... Description Stainless steel pressure gauge:Case sizes: 1.5", 2", 2.5", 3", 4" and 6" Case material: stainless steel ... : 1/4" 1/8" 3/8" & I/2"NPT. BSP. PT dependent on model and size, bottom, back and front ... for option Accuracy: 1.5" 2" 2.5" 3" -ASME B40.1 Grade B(3-2-3%), 4" and 6"-ASME ... %) Options and accessories: custom dial, metric scale, DIN 2.5% accuracy, restrictors, special connections and more