The tester allowed me to find a very elusive leak on a vehicle that I had been chasing for weeks and which was going to cost me a good bit to get diagnosed. It was just a slightly loose hose clamp which was corrected in about 30 seconds so as far as I'm concerned, it's already paid for itself. This replaces an older tester I had which stopped working awhile back. I am sure I will be able to make future use of it. I do wish it had come with a cap test adapter but I guess you can't have everything...I will have to fabricate one of those but that shouldn't be too difficult.