This is a very important tool to have in your car in a bug-out bag. It doesn't just check the air pressure in your tires. If you were ever in an automobile accident or came upon one, you would be able to cut the seat belt with the cutter part. There is also a built in window hammer on the back side of the cutter that flips up when you need to break a window to get in or out. There is a red LED light and a flash light in the head of the unit. For such a little handheld unit, it will be useful in an emergency. The tire pressure reading is on the window display and turns off after 90 seconds.
I received this product for free for my honest and unbiased review.