Have you ever wondered what extreme conditions your package might encountered when being shipped from one place to another? Most of the time a spike in temperature isn’t going to hurt the contents, but if you are shipping frozen goods, it’s important that it not get too warm. If you want to be absolutely sure that no excessive temperatures were encountered, you might consider packing in one of these Irreversible Threshold Temperature Indicators in the package.

As the name implies, these strips will measure the temperature, and record any temperatures outside of the established parameters. When the package has been received, you’ll be able to see how high (or low) the temperature reached, and how long it stayed there. You can get these strips for frozen products, chilled products, and ambient temperature products. These each monitor for different temperature ranges, so as to be most effective for your needs. A four-pack will only cost you $9.