I don't want to have to acidify my samples. I understand it may introduce error. But I don't want to have to acquire very pure and strong acid. Nor do I want to keep such acid around for something I may only do couple times of year. This would make a simple to use inexpensive test much more complicated and costly. I would not go through the trouble because I am a hobbyist.
No one has at any point suggested that it would be appropriate for a typical hobbyist to acidify samples prior to shipping them to Triton.