I continue to use JBL kits and have seen nothing which leads me to think they are giving erroneous results. Other experienced hobbyists who have moved to JBL (plus a couple of highly respected retailers I deal with) are also firm advocates of the JBL kits. Others have been suggesting the Sera kits as another alternative, but I have no personal experience with the brand. We continue to see issues with API kits.
I'm forced to purchase JBL kits on-line from overseas because we still have no importer in Australia. I would far prefer to support local businesses, but I simply don't have the option in this case . . . . . Even the retailers I mention above, while being advocates of the products and using them for in-house testing, are unable to stock them for customers because they can't source them cost-effectively through an Australian importer.
Despite suggestions above, I certainly have no personal commercial or other vested interest in this brand, or any other brand. I'm purely a hobbyist.
I'm guessing that because these tests kits are in general all based on the same reagents, then from the perspective of colour-blindness, there will be little difference between brands. Perhaps if you have a decent LFS near you who stocks alternative brands, then they may be willing to do some trials for you. Perhaps see if you can find (or manufacture) a couple of water samples with a decent ammonia and nitrate level and test with a couple of brands to see if one is easier for you to use than another? Can I suggest that if you do this, then the results could be of value to others. Photograph and post your findings!!
Edited by humbug, 12 August 2018 - 10:55 PM.