HD700-NIST / Extech Differential Pressure Manometer - 2PSI with NIST.Max/Min/average recording and Relative time stamp.Data Hold, Auto power off and Zero function.
HD750-NIST / Extech Differential Pressure Manometer - 5PSI with NIST.Max/Min/average recording and Relative time stamp.Data Hold, Auto power off and Zero function.
HD755-NIST / Extech Differential Pressure Manometer, 0.5PSI,includes Traceable Certificate.Measure gauge or differential pressures from 0 to 0.5 psi in 11 selectable units of measure.