The ‘scope works like a champ! Was able to track down an arcing electrical contact under the hood with the engine running. While searching, I used the closed attachment and was able to hear fuel injectors firing, fuel and air running through hoses, mechanical items, etc.In the end, I used the open attachment to track down the arc, then the closed attachment to pinpoint and verify the component.This scope works beautifully! I previously bought and returned an amplified version because all I could hear through it was ambient engine noise. This mechanical one from Lisle works much better for a LOT always money.Others have complained about one of the ear tubes being blocked, but mine were both fine.Now on to the “hatin’” �� I read a lot of complaints that, now that I’ve used this item, are frankly ridiculous. Honestly, you’d have to be dim to not get how this item works.1) “it hurts your ears” – the ear pieces are drawn together using a strip of spring steel. It was little tight on my head out of the package – 3 seconds of bedding the “spring” outward and what do you know – no more pinching! Personally, I would prefer a smaller ear tip, but I could easily accomplish that with a little sanding.2) “no instructions” – wow. There is a closed-ended rod with an “amplifier” that is used for sound conduction by touching the item you want to test. There is also an open attachment with a “funnel” on the end that is used to track down vacuum or pressure leaks, or to isolate a sound prior to pinpointing it with the other attachment. The attachments slip into the end of the pickup tube. That’s it.Honestly, if you can figure out how to use this ‘scope, or how to bend/shape the earpieces to be more comfortable, or how to drill out one of the ear tubes if it’s blocked (which definitely is a defect), then you just don’t need this device – any problem you might be able to track down with it would definitely be beyond anything you should be attempting to repair yourself. If these issues seem difficult to deal with then please take your car to a repair shop!!Anyway, this is a great tool that works as advertised and exceeded my expectations. Any reasonable DIY’er should be able to understand and customize this tool for their individual purposes/comfort.
