My Chrysler Sebring had a small but annoying coolant leak in one place , which I could not safely reach with the engine running. I connected the tester, found it and fixed it in 15 minutes. Justifies the price of this tool. This is not a store quality tool. The cap adapters are fine, the pump is a bit flimsy, but I would highly recommend it for the self-taught crafter "Harry the Homeowner" who does the occasional shade tree project.