I bought this a few months ago. Worked fine at first, right after purchase. Then I didn't touch it for 3-4 months and when I went to use it again, the battery was apparently dead - half of the digits did not illuminate. Kind of strange, as I expect my electronic items to maintain battery charge for a few months if I am not using it. I thought "fine, at least these guys provided a spare battery", replaced it, and tried again. Now the display was bright, but the electronic measurement was WAY off. Sometimes it would measure too little, sometimes it would end up at 500mm when I moved it maybe 25mm. That's not how it is supposed to work. I am not going to bother with replacement/warranty as this is a fairly cheap item, and it will work fine as a caliper, just not in the digital way. But I am quite disappointed.