Easy-to-read 63mm dia gauge. Reads up to 300psi (20kPa). Cone adaptor fits all spark plug holes. Includes 150mm straight and angled push-on connectors; 400mm flexible extension with 10, 12, 14 and 18mm adaptors; and tough storage case. Easy-to-read 63mm dia gauge. Reads up to 300psi (20kPa). Cone adaptor fits all spark plug holes. Includes 150mm straight and angled push-on connectors; 400mm flexible extension with 10, 12, 14 and 18mm adaptors; and tough storage case.