If you’re U.K. based, don’t buy the confirm wands. U.K. customers pay £17 more than USA customers for a box of 20. Also, the wands sold to U.K. customers are half the threshold of 15, not 30 sold in the USA! So not only are you getting charged more money but for half the sensitivity. Lastly, the efficacy of the wands are questionable with a lot of women getting incorrect results not reflecting their true values. A Facebook poll was created because of this where 59 women said they should discount them given we pay more for a lesser threshold wand. Mira has refused! Australian customers are also charged more for these wands for half the threshold American customers received. Don’t waste your money. If you want to track progesterone, use Proov! Cheaper, with a higher accuracy rate.