I would trust one but FRER's are more sensitive then the dollar store HPT's. I would take a FRER over a dollar store HPT.
Not true. They're both 25mIU/mL .
I read that FRER were 6.5 mIU
At peeonastick.com it says the older ones are 12.5 but the newer ones are 25. Do you have a source? I could be wrong, and will admit if I am
ETA: Sorry, peeonastick.com says that they're 15 mIU/ml but says it's from third party sources. FRER doesn't publish how sensitive they are, I guess.