MASTERCOOL (99134-A Blue R134A Digital Manifold Gauge Refrigerant: R134a Refrigerant capacities of over 1000 vehicles Pressure & Vacuum Display: Low Side  PSI, Bar, MPa, Kg/cm2 & IN-Hg High Side  PSI, Bar, MPa, Kg/cm2 Temperature Display: -40 to 200F (-4 to 93C) Response Time: 250 mSec.