Hach SpecCheck Secondary Gel Standards Set, DPD Chlorine - LR, Chlorine Testing, Water Quality Standards, Accurate Chlorine Measurement, Laboratory Grade Chlorine Standards, 2635300

Product was as described and was only a month old so the expiration dates were far enough out that I would have a long life use for the item.

They expire less than a year from date of receipt

This product is used to perform monthly accuracy checks required by the state of Texas for Hatch Chlorine Testers. The product arrived on time and was well packaged.