I have used this for a long time and I can get quite consistent readings with it. I've found that accuracy has not been what I was expecting.
After battling phosphate for a while I got a Red Sea Pro phosphate test kit and it showed a very light initial colour, fading to almost nothing after the 15-minute wait period.
I therefore purchased a reference solution to test the kits and this has 0.08 phosphate in it.
The Red Sea kit gave me exactly 0.08. The Hana kit gave me 0.27. I retested multiple times and got consistent readings from both kits.
So I now have zero phosphate, although some will be used up by the tank, the little bit of algae I have and corals, but that's not what I was aiming for and it's happened due to reliance on a test kit.
I got new cuvettes for the Hana and still got the same consistently high readings, these being far higher than the range of accuracy promised by the test kit. The only thing I haven't tried is new batteries, but I don't see why that would make a difference and the low battery warning has not shown.
Always test your test kits!
After battling phosphate for a while I got a Red Sea Pro phosphate test kit and it showed a very light initial colour, fading to almost nothing after the 15-minute wait period.
I therefore purchased a reference solution to test the kits and this has 0.08 phosphate in it.
The Red Sea kit gave me exactly 0.08. The Hana kit gave me 0.27. I retested multiple times and got consistent readings from both kits.
So I now have zero phosphate, although some will be used up by the tank, the little bit of algae I have and corals, but that's not what I was aiming for and it's happened due to reliance on a test kit.
I got new cuvettes for the Hana and still got the same consistently high readings, these being far higher than the range of accuracy promised by the test kit. The only thing I haven't tried is new batteries, but I don't see why that would make a difference and the low battery warning has not shown.
Always test your test kits!