I work on Cars for Free.. the Requirements are you SOMEHOW have to be related ( or Dating ) someone on my Family Tree.. and the Injector problems were something I needed to be able to answer on the spot.. rather than ship off to be tested.. I purchased a 'Launch' Chinese junk bench.. $800 and I figured it was a Good starting place to figure them out.. If I was to do it again, I'd go after the $1200 " Blue One " they sell.. Mine was the red one.. the Blue ( Different Name ) has better Adaptors for the Injectors, and the Testing Electronics are better.. But for me I'm able to test the 300's Injectors by Pulling the Fuel Rail, and using that to hold the injectors, and do them 3 at a Time.. this way it also tests if the lower seals are leaking.. I could never make any money testing injectors with it, but it answers my Questions for troubleshooting..