These are basically a G-limit indicator. They come in 5 different G ratings (this one is 50G). There's a little tube of liquid in the middle that has dye released into it if the package to which it's attached gets dropped hard enough; turning the tube red. They are made by www.shockwatch.com, and can be purchased for about $2.00 each from a variety of web sites. I discovered these while watching Mythbusters. They use them as cheap excellerometers all the time.
1 comment:
I've used these for shipping electronic test equipment! Got the material handlers in some deep trouble for dropping a rack-mount computer once. Suppose you could put one of these in your helmet for bragging rights?
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