The R3002-NIST is a compact digital manometer for gauge and differential pressure up to 5 psi, switchable across 11 pressure units including psi, kPa, bar, and inH2O. It adds Max/Min/Average/Relative readings, a built-in real-time clock for time-stamped logging, USB output with bundled software, and a backlit display for low-light job sites. A tripod mount supports unattended long-term monitoring, making it well suited to HVAC diagnostics and low-pressure gas system checks, and it comes with a NIST-traceable calibration certificate.