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LaMotte Test Kits
It sounds like you have the comparator. The slide system has the reference in a bar that is moved until the color aligns with the sample tube. I had one several years ago and preferred it to the comparator.
The best way to get info on the kits is to go to the LaMotte web site but the Nitrate kit Pet Warehouse sells isn't even listed on the LaMotte site (or at least I couldn't find it).
Also the pH kit Pet Warehouse sells is not very useful. It has a range of 5.0 - 8.5 in 0.5 increments but the color change in the last half of the scale is not very clear. LaMotte sells a couple of narrow range kits that would be more suitable for aquarium use. The old Bromthymol blue mainstay has a pH range of 6.0 - 7.4 in 0.2 increments and the have a Phenol red kit that would be better for my use that has a range of 6.8 - 8.2 in 0.2 increments.
However these things cost over $25 each. It will be a VERY long time before I buy another LaMotte kit considering the quality has taken such a decline.
This may be a stupid question but...
What is the difference between the octa-slide and octet comparator? I have
the LaMotte narrow range pH test kit. It came directly from LaMotte since I
found no one else that carried it. It is in the older box you describe with
a foam insert and a square black box of comparators where you slide the test
tube into one of the holes in the box so you can read it. I assume this is
the octet comparator. I am not familiar with the octa-slide, can you
describe it? After looking at the Pet Warehouse website, it is difficult to
tell anything about the kit.
Daphne in Atlanta, where we don't even remember what rain looks like!