Normally, I would not be such a bug for measuring. But in this case I am actively changing my water params from the tap to accommodate the fish. I am shooting for a pH of 6.0 which is a problem for most hobby kits as the low range ones tend to stop at 6.0. Since the tank can be lower than this, test kit results wont suffice.
Moreover, the pH tend to rise between water changes and I premix the new changing water. I need to get the new water treated with the rooibos tea, Kent Black Water Expert, some percent of ro/di water (about 20-25%) and finally some muriatic acid to drop the pH. Usually the new water is in the mid 5 range pH wise in order to get the tank back to 6.0. So I cannot use a test kit for the new water.
Finally, when acid water fish arrive from the wild, it is important to start them in similar levels to those from where they were captured. One can move them to higher levels over time, but it must be done gradually and takes good monitoring.
And that unit wasn't a break the bank one, I picked it because it was the same one the importer from whom I got the last batch of altums uses. It is only about 5 times what the API master Kit costs.
Oh yes- the price for Altums isn't as big an issue as the cost of the equipment needed to keep them alive initially. I pay under $20/fish. But then I bought a UV unit, the digital testers, special meds to have on hand, catappas, alder cones, rooibos tea, black water expert. Then there is the cost of a 6 foot display tank etc. The fish end up being the smallest cost
And that is why they say fish keepers are crazy and I am not so sure they are wrong.....................