- Joined
- Feb 28, 2017
- Messages
- 607
- Reaction score
- 378
I use the Hanna ultra low phosphorous test and always found it accurate until very recently. Now I’m getting weird high readings when I know it’s close to zero so I restest to confirm. Like today, my first reading was 78 followed by the next 2 tests at 0 and 2. Seems to be an every time I test now the first one is way out. My testing is no different than I do each time. I have also tried repeating the test with the same vial using a new vial of tank water and that comes in as expected. Anyone else have issues like this. Getting tired of having to repeat 2 or 3 times because I can’t trust the first one. Also we’re not talking within normal accuracy. Like today it can be 28 followed by two o’s or 18 followed by a 0 and 3. Could the meter be going bad?