This Gov Reg Adjusting Tool features a rubberized gauge protector, an easy reference gauge (in red) for wine on tap, direct draw, long draw, or nitro / Guinness systems. The Glycerin filled gauge is accurate to +- 2% and keeps your system tamper proof as only installers and technicians with the tool can adjust your regulator. The pressure adjustment knob is simple: turn clockwise to increase and turn counterclockwise to decrease.