For home water, how about monitoring for arsenic, fluoride, lead, and oxygen?
$80 Open Source Chemical Analyzer
"It's reaching to say that they've built an $80 chemical analyzer, because a lot of prep work and specialized electrodes (platinum!) are needed to run some of these analyses. This is a cheap lab instrument, not something you take out in the field to make measurements. Ruggedizing and standardizing reagent solutions are what would make a field instrument much more expensive."
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