A precision impact detection device intended for use on the outside of a shipping carton. Non-mechanical and non-magnetic, it features a tiny liquid filled glass tube housed in a self-adhesive label. If a carton is dropped or otherwise sustains a severe jolt the liquid in the indicator changes from clear to bright red. The indicators are non-resettable giving clear visual evidence in which leg of the delivery chain that the damage was sustained.

The indicators are rated according to the G forces required to trip them;

Green – 100 Gs at 50 ms Avionics, AV equipment, Service/repair electronics, Computer equipment, electromechanical equipment, instrumentation/gauges.

Orange – 75 Gs at 50 ms Chinaware, Porcelain, Furniture, Glassware

Red – 50 Gs at 50 ms Neon signs, Displays, Artworks, Exhibits

Yellow – 25 Gs at 50 ms Palletised goods, heavy furniture