I ordered this to inspect the insides of motor cylinders. I was able to diagnose a broken valve simply by removing spark plug and looking inside. Definitely worth it.

As a mechanic, i use this almost daily. Great purchase! Way better than those phone usb cameras! Positive points: -The image is clear. -Lighting is sufficient for dark or semi-lit conditions. -Battery capacity is enough for multiple uses before recharging. -Lightweight. -Nicely made carrying pouch. -Can take videos as well. Negative points: -The "take a picture" button is placed like a pistol trigger so that when you try to use the joystick to move the camera you always hit the button and take lots of unwanted pictures. -If you point the camera where up is up and push the joystick up, the camera goes right instead of up. There is a 90 degree difference in the angles. You get used to it though.