Features and Benefits: Widely used in motor diagnostic work Check for leaky intake manifold clogged muffler and leaky burnt or sticky valves Diagnoses incorrect timing Determines accurate fuel pump pressure Locates leaks in gas line Readings shown and interpreted on face of multi-colored dial. 3-1/2 gauge has English and metric scales. Has range of 0-28 inch (0-70 Cm) vacuum and 0-10 PSI (0-0.7 Kg/Cm2) pressure. Complete with hose three fittings and operating instructions. Packed in a storage pouch.