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Tetra Oxygen Test - A Review


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  • Regular Member

So I mentioned a week or so ago that I had ordered an oxygen test and I would comment on it once I received it. Well, I received it today and ran it a couple times. The procedure is straight forward enough, but it has one fatal flaw, which I think I've captured nicely in the picture below. I apologize for the lack of clarity, I just used my phone camera, and I probably held it too close.

Frankly, I think the pictures do the scale a favor, its even harder to real in person. You can see my results from two different parts of the tank. I think the results are in the middle, but its very hard to tell.

While an interesting idea, I cannot recommend this test - I don't have any confidence in reading the results. After these results I did a little looking, and I found the Red Sea oxygen test:

http://www.drsfostersmith.com/Product/Prod...oxygen&Np=1

The description for this one claims its a 'drop by drop' style test, where the color eventually changes from green-brown to blue. If anyone is looking for one of these and wants to give that one a shot, I'd be interested to hear the results :)

post-14384-1199839647_thumb.jpg

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  • Regular Member

Interesting. What about if you stand the vial and hold it a little way from the colorcode chart. Does the result color look different then?

I use the Tetra test kits for everything but haven't tried this one.

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  • Regular Member
Interesting. What about if you stand the vial and hold it a little way from the colorcode chart. Does the result color look different then?

I always hold my vials up against the white background of the charts in a very well lit area.

I was thinking the same thing when I saw the pic...lying down is not a good way to read those. Although, the sliding pink scale does not look very particular, and in the case of O2, you want to know for sure.

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Hey, sorry, forgot to check down here.

Yes, I did not read it with the tubes laying down. That's simply the way I took the picture. I think its even worse holding it up. Depending on the quality and brightness of the light, whether I hold right against the card or a bit away from it (although Tetra says to do the former), the answer seems to be different. And, in fact, at no point am I 100% sure about the answer. Are we looking for the darkness of the pink? Or the 'quality' of it (meaning, is it redish or not)? I dunno.

The picture is taken with a phone camera while lying down, so its not the greatest picture, but, trust me, its very hard to read with any confidence. I feel the picture actually does it a favor.

A similarly-fish-keeping coworker is placing an online order for some supplies, so I'm going to have him order the red sea oxygen test for me so I don't have to pay a full slate of shipping for one test. Its a drop-at-a-time (KH/GH style) test, so I'm hoping it should be easier to see a distinct color change (from brown-green to blue) than a shade of pink.

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