I found this in the Pharmacy and gave it a try. The 2nd month I realized that it looked the same when clean and after putting saliva on it. Luckily I had the receipt and the Pharmacy took it back. I was very unimpressed with the device. I found Clear Blue Easy much easier to use - however, I had to order it from the US and it is quite expensive - but it seemed to be accurate. However, we have discovered other issues and are just in the middle of our first IVF cycle - fingers crossed.