Yellow Jacket Blue Compound Manifold Gauge 49138 3 1/8" R-404A, R-410A, R-22, °F PSI With 1% accuracy (Class 1) calibration. Large 3-1/8" gauges are housed in a blue steel case with front recalibrator screw. High visibility colored temperature scales are easy to read through the full view polycarbonate crystal.
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