42004 Mechanical Manifold Gauge Set is a high-quality set of manifold gauges that is designed to help you with refrigerant work. This 2-valve manifold gauge set can be used on R-22, R-404A and R-410A refrigerants. It has a forged brass body for durability. The gauges have a blue low side scale from 0 to 350 psi and red high side scale from 0 to 800 psig. Each gauge features an accuracy of +/-1.00%.