Sigh. I've been so protective of it I can't believe I did it. I was so busy messing with the pool before we left for the grandparents for Christmas, the wife had the kids loaded up in the car and I'm trying to add some CYA via a sock, bring the FC up, pH down...etc etc.
Anyway, I just discovered when we got back that I left the kit out for 4 days (cover shut, thank goodness). But I know it got down close to freezing at least one night.
Do you think I can trust the readings or should I toss it?