Uniweld’s G409NSAD NPF® 3-1/8″ [80 mm] gauge provides steady and accurate pressure readings. The encapsulated silicone dampened movement seldom needs recalibration. The gauge is guaranteed not to leak fluid and not to lose dampening characteristics. Scales are printed in refrigerant colors. Gauge has a R-134a/R-12 [Automotive] PSI-°F pressure/temperature scale.