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This Replacement High Side Gauge fits OEMTOOLS and other brands of A/C manifolds used to service A/C systems on cars. This car air pressure gauge comes with an easy to find calibration screw on the front so you can adjust the calibration with a small flathead screwdriver and make sure your readings on your A/C gauges are correct. Features a gauge specifically for R134a, to be read together with a low pressure R134a gauge to monitor refrigerant levels,Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^