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Yellow Jacket 49138, 3-1/8" Blue Compound, 30", 0-350 psi, R-22/404A/410A Gauge degrees F
Large 3-1/8 inch gauges are housed in a red or blue steel case with front recalibrates screw. High visibility colored temperature scales are easy to read through the full view polycarbonate crystal. Flutter less technology with brass surge protector to minimize needle pulsation, brass gauge movement. Copper alloy bourdon tube, color-coded refrigerant types.