R134a R12 R22 Single Manifold Gauge 4 Testing Charging Auto Home Air Conditioner Single Low Side Brass manifold Gauge for testing and recharging A/C Freon Gas on your auto or home Air Conditioner. Single Low Side Manifold Gauge Easy to read gauges feature 3 PSI scales (R134a, R22, R12) and Fahrenheit scale Heavy duty brass manifold body is highly durable and lightweight Vibration resistant gauges feature a flutter-free design with provides accurate readings Heavy duty solid brass connections resists wear and last a lifetime Can be used for Auto, household, or Business air conditioning units Included: Single Manifold Gauge