O2 testing

[Lou15e80]

Hi everyone I'm new to the group and keeping fish I have 12 penguin tetras I have just tested the oxygen in the tank but I am struggling to read the results can anyone help? With it being the same colour just different shades it is quite difficult
Thanks for your help
Louise

 

[Vorpal]

You have to hold it so the card is an even distance from the vial, top to bottom. Sometimes the instructions say how far away to hold it (1 cm / 0.5 inches?)

 

[Lou15e80]

It says a finger width away which is why my finger is behind it ill take another and get it straighter
Thanks

 

[Vorpal]

It looks like 2 mg/l, but it could be a bit higher. Likely less than the 5 mg/l on the next one?

It's a bit hard to tell on the photo, and that type of kit is a bit hard to read, anyway.