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[–] ChaoticNeutral ago 

I work on ion selective electrodes and bio-fluid sensors. I just skimmed the page. It looks like they are using standard water probes. If they use high quality ones it could be pretty accurate. If they are correcting for temperature and pH, know their cross selectivity, etc. They could be pretty could for yes/no testing. A really high quality tool that is good for quantitative measurements usually carries a matching price tag.