Clearblue Advanced Digital Question

Rebec

Weird question, but I have about 4 strips left over from the last pack of 20. If I go get another pack of 20 - do you use it with the new reader or do you keep the old reader? Does it matter?

I don’t honk they sell just the refills of test strips without the digital reader, right? Just feels wasteful, but maybe the readers don’t last for more than 2-3 months?