I tested it as soon as I got it in March and it worked well. It pumped up my rowing board. I bought this as a gift for my husband for the summer so he doesn't have to download boards. We took it with us on our first hike and it didn't work. It didn't blow air or even measure PSI when we inflated it manually. The warranty is only 75 days and Revain's 3 month return policy has expired so I'm stuck with a pump that doesn't work. that does not work. I should have taken the advice of the other reviews and not bought this product but I was really hoping it would work.