I've seen prominently labeled tilt sensors in use on freight shipments of computer equipment. They're not electronic. Tiny (<1mm) beads and adhesive are enscon

I've seen prominently labeled tilt sensors in use on freight shipments of computer equipment. They're not electronic. Tiny (<1mm) beads and adhesive are ensconced in an oddly-shaped plastic bubble. If the freight pallet is tilted more than a few degrees, the beads move and get stuck to one of the adhesive patches. Simple, but effective: I never had to call the company about damage.