The R3030-NIST digital manometer handles gauge and differential pressure readings up to 30 psi across 11 selectable units of measure. It's built around a large backlit display with onboard memory for Max/Min capture, rated accuracy of about +/-0.30% of full scale, and a roughly half-second response time on a single 9V battery. It's a practical choice for HVAC work, pipe and pneumatic pressure checks, and general field engineering tasks, and this version ships with a NIST-traceable calibration certificate.