For those of you who don't check the temping threads I'm posting this here as well.
I use a persona instead of a cb fertility monitor, but they're pretty much the same thing.
Anyhoo, this month with money burning a hole in my pocket I bought a CB digital OV kit (a little device with 5 or 7 test sticks, can't remember exact amount, for £22.99 in Boots.
It's a great bit of kit, uber-precise and when you hit your LH surge it gives you a symbol.
The only drawback is you can't buy replacement sticks and are then stuffed every month for another whole kit
HOWEVER, today I bought a new box of persona sticks and at 5pm I put on in the CB digi, poas and lo and behold a face.
I realised yesterday the 2 types of sticks looked identical and when I rang the helpline over a faulty reading, the website gives info on Persona and CB on the same webpage. They are obv the same bloody things!!
What this means girls is for £23 (or £18.38 in Sainsburys) you get a kit for one month then replacement opk sticks for about £8-9, which will last you another 2 months.
Sooooooo cheap!!