Don't waste time guessing what's wrong with your boat's engine. Marine diagnostic tools allow you to easily scan a marine engine to determine if something is malfunctioning or inoperable. At Discount Inboard Marine, we carry the marine engine diagnostic tools you need to determine the problem safely and efficiently — every time. Our selection of marine diagnostic tools includes a timing tool and a MEFI code reader. The marine diagnostic scan tool can be used for engine monitoring, malfunction trouble code reading, data logging and more. Find your new marine diagnostic tools today with the help of Discount Inboard Marine.