Can be carried in shirt or pants pocket. Will test all small engines with M14 or M18 threads. M12 and M10 adapters are available. Valve core at bottom assures accurate readings. The 1-1/2" gauge has a dual scale dial with ranges from 0-200 psi and 0-14 bar. Has red numerals to read psi and black numerals to read bar. Hydraulic hose and crimps insures long hose life. Can also be used on cars and light trucks where spark plug holes are easily accessible.