Seachem test kits vs. API test kit

[Anna94]

I'm thinking about switching over to the Seachem test kits (ammonia, nitrites/nitrates, and ph) because not only do they seem more accurate than the API test kit, but they seem much simpler to use; as in there are no test tubes to fill up and rinse out and you don't run the risk of dropping and breaking them. Also, every test tube I have leaks when I shake them and I'm really tired of getting the liquid reagents all over my hands and pants. So I feel switching to the Seachem test kits will be the right move for me. What do you all think?

 

[Essjay]

When I use the API tester I hold the tube with my thumb under the bottom and a finger on the lid and I squeeze hard as I shake. I don't get any leakage.
I don't mind washing the tubes, it makes a change from washing dishes


I wondered if the Seachem ones were strip testers till I looked at Seachem's website. I have not seen kits that are used like that before so I can't comment on how good they are.

 

[Anna94]

I have a physical disability so my fingers don't stretch wide enough to shake the tubes like that.

 

[StevenF]

As far as accuracy goes neither is truly accurate. The reason I say this is that they require the user to match the sample to a color chart. Each person sees colors a little differently. Some are even color blind. The second reason is that the frequency spectrum of the light affects how you see colors. In direct sunlight there is more red and yellow in the light while in indirect sunlight there is less red and yellow but more blue. Indoor lights generally don't match the suns light spectrum. So overall there are a lot of factors involved in reading color charts.

I have not yet found any test that relies on color charts that also has an accuracy specification. Whenever possible I get a Hanna colorimeter:

http://hannainst.com/products/checker-colorimeters.html

Each one has an accuracy specification. These meters use a LED and light sensor to read the colors of the test sample. Unfortunately they don't have a nitrate checker. But they do have a very good ammonia, KH, phosphate, copper, and iron checkers. They cost more but they eliminate a lot of the potential errors in the test. They also have some good PH meters but there are more costly and need maintenance ( calibrations, cleaning, and occasional sensor replacement).