Yellow Jacket 49016 Class B Manifold Compound Gauge, 30 in HG to 120 PSI, 1/8 in MNPT Connection, 2-1/2 in DIAL, 3-2-3%, Blue

High-visibility dials - colored temperature scales for easy reading, Flutterless technology with surge protector minimizes the needle pulsation for improved accuracy, Calibration traceable to NIST standards, Gauges not meant to be used with nitrogen, Small screw in back is 6/32 x 5/32 in Phillips pan head screw, For use with R-22, R-134A, R-404A refrigerants, Steel case for durability and high - visibility dials with colored temperature scales for easy reading