The Dwyer Minihelic differential pressure gauge offers small size & low cost, with sufficient accuracy for the majority of applications. Accuracy: +/‑5% of full scale at 70°F (21.1°C). Pressure limits: 30 psig (2.067 bar) continuous to either side. Size: 21⁄16" (52.39mm) diameter dial face. Connections: rear, barber for 3⁄16 tubing. (⅛" M to order). Mounting: panel mounting. Diaphragm in vertical position.