Yellow Jacket - With 1% accuracy (Class 1) calibration. Large 3-1/8" gauges are housed in a red or blue steel case with front recalibrator screw. High visibility colored temperature scales are easy to read through the full view polycarbonate crystal.
Flutterless technology with brass surge protector to minimize needle pulsation
Brass gauge movement
Copper alloy Bourdon tube
1/8" NPT Male connection
Calibrated to 1% accuracy
Color-coded red for pressure and blue for compound
Color-coded refrigerant types

*These gauges have °C and °F on dial
**Features retard protection to 350 psi
***Features retard protection to 500 psi