Robinair 43160 Aluminum 4-Way Manifold Digital Gauge Set for use with 17 Common Refrigerants 4-Way Solid Aluminum Manifold with Digital Gauges - hoses not included but available separately Gauges are calibrated to measure 17 different refrigerants - R-12, R-22, R-123, R-124, R-134a, R-401A, R-401B, R-402A, R-402B, R-404A, R-407C, R-408A, R-409A, R-410A, R-502, R-507, and R-508B These accurate gauges allow you to choose the temperature - degrees Fahrenheit or degrees Celsius, and pressure units - PSI, bar, kPa and kg/cm3 The low-side gauge has a pressure scale of 30 inHg VAC to 250 PSI and the high-side gauge has a pressure scale of 0 to 800 PSI Gauges come with a view enhancing backlight making information easy to read at a glance, even in low-light conditions