TheRedDarren
Fish Crazy
Do they expire? I've just picked one up that's about 5 years old (thrown in with a used tank) and wondering whether the results would be accurate?
In my personal experience my API Ammonia tests gave false high readings. I tested two different Master Test kits from two different suppliers with two different valid lot numbers. My Salifert test read a known ammonia free water sample as zero. Both APIs read 1 - 2 mg/l.
I`ve used the API kits for a few years and have never had any problems with false readings with them