I purchased the digital ovulation kit only to find that there was no digital reader in the box - only test strips. I returned the digital kit and got the combination pack above since there were no more of the digital at this particular store. I followed the directions exactly, waited 3 minutes, 5, 10, 30 and got nothing - no indication or line what so ever. So, I tried it again, thinking perhaps there was user failure, but again, nothing. I'm not impressed - while it's not a huge amount of money, given the failure of the original purchase then the failure of the second as well, it is pretty disappointing and frustrating.