Hi! I have never come across those strips. I am using eSHa Aqua Test for NO2, NO3, KH, ph, GH and TH. It is not always very easy to tell the amount of nitrate from the pink colouring on the strip. I wish it was more accurate. I paid, I think £11 for 25 strips. I wonder if Biorb - Test strips are any better.
I would think they are an exact copy of the Tetra ones I have the Tetra ones and think they do the job nicely. Just purely out of interest as it doesn't say in the instructions how long do you submerge the strip for?
I also got the Ammonia checking kit for £8.99 as the strips don't test this unfortunatley.
It does tell you on the instructions linsay under How to test? it says: Holding only above the arrows, remove a test strip and tightly close the container. Without touching the test fields with your fingers, dip the test strip into the water for about 1 second (the arrows should point to the water service) Shake off excess liquid and after about 60 seconds compare the test strip colours with the scale on the tube. Do not hold test strips under flowing water.