Hey all. I would like to know if a test kit can "go bad", meaning not reading correctly. I use the Hagen master test kit (i know not the best but...) witch i bought a long time ago... like 4 years or so maybe more, cant remember. i still have some tests left since i use to have a FOWLR so i didnt test everything at that time plus i was out of the hobby for a couple years after that. So all and all its an old test kit. Im starting to doubt the results cause i bought a new seachem PH test kit witch reads 8.2 and my hagen is at 8.8. So im guessing either the hagen test kit sucks or that its getting old and the results arent good. Theres no expiration date on my hagen so i just dont know. Do they expire or are they always "good" but just suck? Thanks for any input. Marc.