Water testing

Thanks for the reply. Unfortunately the digital meters just test for dissolved solids, i.e. minerals and metals. What I am really interested in testing for are things like e-coli and other biological contaminants. I already have the ability to test for the minerals and such (Zihuatanejo city water is verrry hard). The bacteria testing kits usually require collecting a sample and adding a chemical that will change color over 48 hours if a set of specific bacteria are present.

A year or so ago after installing my 6-stage RO water filtration system I inquired at the laboratory that is across the street from the Bomberos about biological testing.
They said they perform it there but it was not inexpensive.
If I remember correctly they told me I would have to bring in 2 samples of water in sterile bottles.
I never got around to it.
Not long ago I tried to replace the UV filter which I purchased at the pool supply store HidroTeam near Sam's but the plumber somehow disappeared on me (long complex story)
If you find a kit that does it I'm all ears