You can use Babyndex as many times as you want. This way, you can save a lot compared to purchasing loads of single-use hormone stripes on the market!
A 2018 study by Harvard Medical School showed that saliva test can predict ovulation with more than 99% accuracy, if complemented with automated crystal detection.
Your saliva crystallizes during your fertile days. Hence women with irregular cycles can also use Babyndex. There is no need for months of body temperature data.