We hope you never have a problem with your Block Tester, but if you ever do, take comfort in the fact that we back it with a limited lifetime warranty against defects in materials or workmanship for as long as you own it. Just get in touch with us, and we’ll make it right by either repairing or (more likely) replacing the tool. This warranty does not apply to the test fluid as it is a consumable and has a shelf life of about one year when an unopened bottle is stored in a cool, dark place. Opened fluid bottles should be used within a few months, and the unused portion should also be stored in a cool, dark place to maintain maximum shelf life.