I've used a stick style articulating borescope on my airplane engine for years. It finally gave up the ghost so I needed a new one. I wasn't sure how I would like the semi-rigid tubing versus the aluminum "stick" design of my old scope. I was very happy to find this style is actually easier to use around the engine / inside cylinders because you needn't have a straight path to what you're trying to inspect.My last one had to connect to a laptop to see the image. This Teslong unit has it's own screen and a memory card, both of which make it super simple to inspect in real time and save snapshots or videos to refer to later or send to your A&P.The image is super sharp and the adjustable LED light on the tip is great to get the best lighting, bright for dark surfaces or dimmer for reflective surfaces.The one key thing I've learned with this one is to keep my thumb on the semi-rigid tube oriented with the articulated motion of the head so I know which way the head will move with the adjustment wheel on the head. It took a minute or two but now is pretty intuitive to get the head pointed right at what you want to see, even when it's buried out of view down in the engine.Love this thing!