The only way to test this product (other than an emergency situation)is a trip to the local junk yard. This is exactly what I did (bring leather work gloves for protection while breaking glass). I used the glass breaker from inside and outside a car (you never know if you'll be the rescuer or rescuee. It took a few tries on the 1st window, but that's to be expected as I was a bit hesitant. Also, bring safety goggles for any bits of glass that may fly your way!! I also, cut a few seat belts with the strap slicing function. This was easier than I had expected. The oxygen tank wrench does indeed fit and oxygen tank exactly (unfortunately I know someone who uses one) and she let me see if it fits. The only thing I didn't bother trying was the hex wrench only because I can't figure out when I'd need this. The tool is very very light weight and slim. Fits anywhere and you won't know you're carrying it. I highly recommend purchasing one.
Pros: Does everything it's supposed to and it's extemely light.
Would recommend: Yes
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