Extech 407910 Heavy Duty Differential Manometer (29psi)

Amazon

Wide-range (0 to 29psi) Gauge/Differential pressure meter with 8 selectable units of measure 29psi with 0.02psi resolution 8 selectable units of measure Zero function for offset measurements Data hold, auto power off, and min/max functions

Test-meter.co.uk

Extech 407910 Heavy Duty Differential Manometer. Measures 0-2000mbar with ±2% accuracy. Dual inputs, 8 pressure units, min/max recording, data hold. RS-232 port, protective holster. 3-year warranty.