Refrigerant meter group:It is used for pressure and flow measurement and control when filling refrigerant. It is equipped with two composite pressure gauges, hooks and three 80cm red, yellow and blue tricolor rubber tubes. Refrigerant meter group soft angle seat valve design - the precision design of the dynamic flow double O-ring seal ensures a faster and trouble-free emptying and filling process. Model Number:Refrigerant Manifold Gauge Max Measuring Range:200 PSI & Above Display Type:DIGITAL Dial Diameter:1.9 Inches & Under Applicable:for R410a R-404A R-134a Refrigerant Manifold Gauge 1.Air conditioning manifold tester. Designed for automotive / domestic air conditioning systems. 2.Red and blue manifold instruments, clear scales, vivid scales, with rearview mirror, easy to read. 3.The high pressure valve helps to that the parts are connected. 4.The manifold measurement tool can be set up to service any air conditioning system for diagnostics and charging. 5.Comes with a sturdy hook