10 Best Ovulation Kits 2022 | Baby Consumers The ClearBlue Digital Ovulation Test Kit 2 Or More Fertile Days is one of the most reliable testing kits on the market. The package comes with 20 tests which are estimated to be a 2 month supply, and a reusable digital ovulation reader. The test is conducted by placing a urine sample on the test and then slipping it into the digital reader.