Not bad. It's definitely functional.
The background is nice and the instructions are clear. But a few things to improve on.
Space should be the key to start. It's a lot simpler that way. You could also make the screen size bigger, so the timer can be bigger. It would do better with a fully black and more easy to read font.
Maybe a sound at the end of inspection to let you know inspection time is up.
It's pretty nifty. But be aware that not many people on newgrounds will find much use of it.