Protect-A-Pak is a single use shock indicator that can be attached to the item being shipped or inside of shipping boxes via a self-adhesive backing. Protect-A-Pak is composed of a cylindrical plastic casing containing two springs, each of which is fitted between two steel balls. These springs are designed to withstand a specific rated g-force. If the acceleration exceeds the rated force, the two balls detach from the axis affected and fall into the plastic casing. As the springs are fitted at a 90 degree angle, each Protect-A-Pak can monitor two axes. A label on the outside of the packaging shows the shipper that an impact indicator is being used.
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