OTC 5605 Deluxe Compression Tester Kit with Carrying Case - Professional Diagnostic Tool for Gasoline Engines - Perfect for Mechanics, DIY Auto Repair & Engine Performance Testing

I'll caveat my review by saying I'm not a professional mechanic. Well, I did have dinner bought for me once after working on a friend's car, so that's sort of like payment. Not sure that qualifies me as a professional mechanic, though.I purchased this kit to work on a friend's car (a different friend, I have at least 4 of them) that had a suspect head gasket issue. I've always wanted a compression tester and this was the perfect reason to buy one. I own other OTC tools and I've been really impressed with them. Along with the other positive reviews here on Amazon, I had no hesitation buying this kit. OTC has another compression tester kit (OTC 5606 Compression Tester Kit) that has fewer hoses, but it's only 10 bucks cheaper so I splurged and got this deluxe-o model.The kit contains all sorts of adapters and hoses so I'm guessing it'll work on just about any engine out there. It even comes with a little spare parts baggy that has extra valves and o-rings which I thought was a pretty nice touch. Kit feels solid and well made, and has a nice case to keep all the parts together.The gauge is covered in rubber molding to help protect it from any whacks and bangs during use and is pretty accurate. For what it's worth, I rigged up a contraption to compare the OTC gauge to the gauge on my air tank and they measured the same at 100psi. At least now I know the OTC gauged measures the same as the cheap gauge on my air tank.For me, buying this kit was sort of like a rite of passage. My tool box is full of all types of wrenches, sockets, ratchets, whirly-gig thingamabobs, etc., but this is my first real troubleshooting tool. You know, the type of thing that most people won't have in their garage. I'm feeling a little giddy.Overall, I'm very happy with this purchase and would recommend it to a friend--or in this case on Amazon, I'd recommend it to total strangers.