I had a situation where the oil-pressure sensor/sending-units on both of my Chevy V-8 vehicles failed within two weeks of each other. The first one I replaced, I did "blind" by working by feel since there's no way to directly see the sensor behind the intake air plenum and the fuel rails, etc - that was the 8.1L - it wasn't easy to find and get the old part out and getting the new part back in was worse. Then I got to the 6.0L - it was somehow even tighter quarters, even with the smaller engine. My hands are relatively large, and I had trouble getting my hand/forearm in to get to the sensor on the 8.1 - the 6.0 was even tighter, so I ordered this tool. Now I'm wishing that I had gotten this scope before swapping out the sensor on the 8.1L - it made it so that I could see exactly where the sensor was, see the locking-clip on the wire connector to get that loose easily, and then get the socket onto the sensor to remove it. Then, getting the new sensor threaded in straight was MUCH easier by using scope - could see exactly where the port was to get it lined up.The LED light at the camera end is nice and bright and has multiple brightness levels in case things are too reflective in the space you're using it when on full power.The battery life seems really good too - I had it turned on for about 1 hour to do that job with the LED lights on full-power, and the battery-level still says it's at 100%.This scope is much nicer than ones that I had used in the past - due to the longer cable, you can set up the screen somewhere stable and where you can see it easily, and then fish the camera in where it needs to be without disturbing the position of the screen. Even in the bright midday sun, the screen was plenty bright for me to see in the shade of the open hood. I did make one minor modification due to previous experience with other scopes - I took a paint marker and put a white stripe on the camera housing to indicate the "top" of the lens - makes it easier to fish the camera into places in the orientation that you want - that's what I show in the third picture. I like this scope much better than the Milwaukee scope I had bought years ago - this one has a MUCH better and larger screen, and a MUCH longer cable, and the cable is much more manageable with regard to being able to manipulate it without displacing the screen position - so much more convenient to use.This tool easily paid for itself in reduced frustration and by greatly reducing the time it took me to swap out that one sensor - probably cut more than an hour off of the job for me judging by how much faster I got the 6.0L sensor swapped out than the 8.1, even with the fact that the space I had to work was smaller and the angles to get to the sensor were more challenging.I would definitely recommend this tool to anyone - don't think it can be beat - especially at this price-point In fact, I'd say this tool is a "must-have" for anyone who works on cars or does other repairs where you can't get your head in a position to see what you're working on - from a frustration-saving standpoint, you really can't afford NOT to have this. It's simple enough to use that anyone who has the aptitude to do minor repairs should be able to figure out how to use it without even reading the instructions - but I looked over the instructions anyway (after using the scope to do that first job) and they are well written.