OPK’s... brand recommendations please

[Amcg22]

Hi all

AF due tomorrow but wasn’t able to hold off so be testing like mad... done another one today and BFN!

I want to try OPK’s for my next cycle which I plan to order off of amazon. Can anyone offer advice on which brands to go for? I can see there is quite a large price scale between brands so don’t want to waste money if they are known not to be any good.

Thanks in advance

I used one-step mostly as they were cheapest. They still do the job but the dye doesn’t seem as strong. I’ve attached a picture, the green stick is one step and the plastic casing one is sure sign. The sure sign were definitely clearer.