[reefgirl189]

Do you happen to know the date it was manufactured?

Nutrafin tests rarely make it to their "good-until-one-year-after-manufactured-date" claim.

I know I've had to throw out a nutrafin kit. It hadn't worked accurately since the day I opened it. That was a different kit than pH however.

I'm not saying your kit is innacurate but it might be a good idea to test it against a substance with a known pH level just to be certain.