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2-1/2" RED R407C/134a/22 Flutterless™ technology with surge protector minimizes the needle pulsation for improved accuracy 1/8" NPT Male connection 3-2-3% accuracy Calibration traceable to NIST standards *These gauges have °C and °F dials. **Features retard protection to 350 psi. ***Features retard protection to 500 psi. Note: Small screw in back is 6/32" x 5/32" Phillips pan head screw. Note: Gauges not meant to be used with nitrogen
