DAYUAN compression tester set for checking engine compression in vehicles. Compatible with M10, M12, M14, and M18 threads, with a range of 0-20 bar & 0-300 psi.

["Adapter for a variety of vehicles (spark plugs / depths).","Includes 2 rubber-ended for quick check (no need to thread them into the head).","3 inch gauge has dual color scale with 0-300 psi, 0-20 Kpa.","Fitment: M10, M12, M14, M18 (plug, with "O" ring).","Includes 14mm and 18mm large spark plug adapters."]