The Mastercool Black Series Compact 2-Way Digital Manifold Gauge Set performs pressure and temperature calculations for up to 91 different refrigerants, including R-134a and R-1234yf refrigerants. The compact manifold provides an automatic shut-off, offers units conversions, and displays alarm indications (over range, Celsius or Fahrenheit designation, and low battery warnings) directly on its large backlit LCD screen. It also features easy-to-grip knobs, a large sight glass for quick visual refrigerant checks, an accuracy of +/- 0.5 percent FS, and a resolution of 0.5 psi.