I was pleasantly surprised by this digital pressure gauge + multi-tool. (Also remembers the previous mode when turned off) Red LED for reading tire pressure at night LED flashlight Retractable emergency glass breaker tool Saw blade Small pliers Flat head screwdriver Phillips head Small scissors The only negative is that I would like to see a locking feature for Avoiding possible accidents with tools other than glass breakers. The ability to lock the saw open or closed, for example, to prevent accidental cuts if it slips or the like. Otherwise, I'm pleasantly surprised at the versatility and ease of use. Tire pressure readings appear to be fairly accurate with repeated readings. I haven't double or triple compared the accuracy to a known accurate tire pressure gauge, but it seems to be in a decent accuracy range compared to what you'd get from an air pump, for example.