From inside (document excerpt):
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 (°F or °C) and pressure units (PSI, bar, kPa and kg/cm3) your most comfortable using.
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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. · 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 11920 Item # 11910 11920 43160 43166 43180 43186 Description Low side digital gauge High side digital gauge 4-Way Manifold w/ Digital Gauges – No hoses 4-Way Manifold w/ Digital Gauges – 60 ” Enviro-Guard Hoses w/ Quickseal fittings 2-Way Manifold w/ Digital Gauges – No hoses 2-Way Manifold w/ Digital Gauges – 60 ” Enviro-Guard Hoses w/ Quickseal fittings 11910 see part numbers on reverse side The new Robinair aluminum manifold bodies are constructed from solid aluminum for added durability needed for repeated, tough daily use. Contoured easy to grip hand wheels are color coded for quick and easy identification. Full 3/8 ” bores through the body aids in getting the job done quickly and efficiently. · Large, easy to read 3 1/8 ” (80mm) gauges protected by Lexan lenses.