Shelf life of pH paper, 0-14 pH range.
The shelf life of pH paper, 0-14 pH range (catalog number /order code 2601300) is a little over 4 years. There are two labels that will come on each batch of test strips. One sticker plastered over the front of the box will give the date Hach received the item. There is another date listed on the bottom of the box (the print is very small and hard to see) that is an internal number for the manufacturer and is unrelated to expiration.