How much does sample temperature affect dissolved oxygen tests in aquariums?

[Ronald.A]

I’m trying to measure the dissolved oxygen in my aquarium water using a chemical test kit, but my readings seem inconsistent. I’m wondering if the temperature of the water sample when I add the reagents is throwing off the results, because my apartment is quite cool compared to the tank’s heated water.

[PaisleyPC]

Yeah I’ve seen that with dissolved oxygen tests. The sample in the cold apartment warms up while you handle it and the color changes end up jumping around.

[RileyTW]

I tried letting the sample warm to room temp before adding reagents, and then rechecking after a few minutes. It felt more stable, though not perfect.

[LukeT]

Do you follow the kit’s temperature guidance exactly, or is that not stated?

[MasonT]

One time I kept a little log: time from draw to read, exact temp, and which droppers I used. The numbers moved a bit, and I realized timing mattered more than I expected.