The Timestrip Plus threshold temperature indicator shows the amount of time a product has been above its threshold temperature. Designed to operate as a cold chain tool for temperature-sensitive products in the food sector, it is supplied in an adhesive label format and can be applied directly to products or packaging. Activation is achieving by squeezing a bubble on top of the indicator; a viewing window shows the indicator is active by changing color from white to blue. Once the temperature threshold is breached, the color moves across a scale to show how long it has been above that temperature. The indicator can work under a variety of conditions, from ambient environments to refrigerated, frozen and extremely high temperatures.