About the UEI EM201 Dual-Input Differential Manometer
This differential manometer features a dual input measurement, a triple scale (inWG, mBAR, and PSI), a minimum/maximum value capture, a data hold for storing your readings, an auto power-off, and a rugged, rubber boot with integral magnet. This manometer comes with two pressure tubes with brass fittings (BF100) and a 9V battery.