This is for a new premium refco manifold monteurhilfe by pass gauges with 0 screw to realibrate bm2. the model # is bm2-6-f-r410a-1/4sae. it includes both compound and pressure gauges, adjusting screw, compound and pressure connections with open/close valves. vacuum and refrigerant connection, and comes with instructions. this is a really nice set of gauges. all screw on connections come with on/off valves, which aren't seen very often.