Great for my wife's car and bike. Her tires were deflated as she had some health issues, but she started backwards and the tires deflated fairly quickly. Doesn't work on my bike vapor valve, but I have a small pump that I carry around on my bike and a large floor pump, so it's no big deal. Going out at night would be great as the light illuminates things well enough for you to see. I've tried everything in the dark to know for sure.