The REED R3100 is a higher-range digital manometer measuring gauge and differential pressure up to 100 psi (150 psi max), with 0.1 psi resolution and about 0.3% full-scale accuracy. It supports the same 11 selectable pressure units and dual 4-digit LCD readout as other REED manometers, and is commonly used for HVAC troubleshooting, pneumatic and gas system checks, and testing filters, chillers, and pressure-relief devices. Its higher ceiling makes it the choice among this Reed manometer lineup for higher-pressure applications.