With a calculated less than .01% failure rate in our history, warranty is typically never and issue. In the rare instance a failure should happen, you can rest assured that Metrology Parts will take care of any issues you have to get you back up and running as soon as possible. Factory warranty on all items starts the day items leave North American Headquarters to distributors or end users. Stock items when shipped from our facility are documented by serial number and warranties depicted in sales descriptions start the day you receive the items. Regardless of what factory warranty remains on the items shipped, you will be fully covered in the rare chance that a warranty issue arises. With our massive multiple item stock we generally have a replacement item on the shelf and if not we will get you a replacement as fast as possible. We offer free test and check on all items we sell as well as free tech support for all customers even if its on items we did not sell to you. Should you have any questions please do not hesitate reaching out to us at 763-843-1393. We look forward to working with you and will always do our best to earn and keep your business.