Tip 'n' Tell shipping labels use a clever clear plastic design, some liquid and a bit of physics to record if a package has been tilted too far during shipping. There's other similar devices offered for shock and inertia. What other things might be sensed passively, without needing a battery?

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@zens we got some new equipment delivered at work a few weeks ago and it had a similar things to this on but red liquid.


Pressure waves. There are membranes you can buy calibrated to rupture at a specific pressure. If you set up several with different pressure ratings and set off an explosion a specified distance away, you can determine the rough size of the pressure wave created by the explosion at that distance.

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