Hi,
Keep in mind that Hagen test kits are a real hit and miss...not sure why. I seem to have pretty good luck with it and it is sometimes more accurate then the some Salferts and Red Seas. I get 50 to 100 test samples per Ca test kit and the third bottle is usually the one that goes out first. Mind you, I always buy my Hagen from a store that sells a lot of Hagen test kits...so fresh kits are always in the store.
As for reading test kit colours, the pH test kit is quite painful to read if you follow the instructions exactly. But, the test kit will still work if you use less reagent (i.e. 1 drop instead of 3). By making the colour lighter, it is easier to distinquish.
The other thing with Hagen test kits is that they do require shaking before they are used - quite a lot of shaking.
Again, they are not for everybody. You can go wrong with Saliferts. They are expensive, but you get what you pay for.
- Victor.
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