If you want to test yours just to make sueit'll still fire with enough force....maybe see about finding a local junkyard. The police and fire department use junked cars to practice and test their stuff on all the time.
Well mine experience, if you put the resqme on glass and gently increase the pressure on the spring, it will eventually activate but might not shatter the glass. More success if you just hold in in your hands and give it a good whack. The spring power plus the power from your arms combined usually does the trick.
I wrote a little bit more about the resqme on mine
blog.
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