Many times the first tool used to help diagnosis A/C problems is a manifold gauge set with hoses. With Robinair's new digital gauges you can enhance the effectiveness of this long trusted diagnostic tool. Calibrated to measure 17 different refrigerants (R12, R22, R123, R124, R134a, R401A, R401B, R402A, R402B, R404A, R407C, R408A, R409A, R410A, R502, R507, R508B) these accurate gauges allow you to choose the temperature (degrees F or degrees C) and pressure units (PSI, bar, kPa and kg/cm3) your most comfortable using. The low side gauge has a pressure scale of 30 inHg VAC to 250 psig and the high side gauge has a pressure scale of 0 to 800 psig. Gauges come with a backlight to enhance the view and make the gauges easy to see in low light conditions. Features: Includes profiles for 17 common refrigerants, Detects vacuums in "Hg, Selectable temperature and pressure units of measure, Easy to read LCD screen with large digits, Automatic shutdown after 15 minutes of inactivity, Low battery indicator.