Isn't there a government agency that can perform a highly accurate water test? I don't know if it costs anything but I read about it a while back. I think it has something to do with farmers testing water. It might be some state or county service. I don't know how accurate it is but if it is government funded it probably costs a fortune. Has anyone ever used such a service? I ask because I read a post about metal levels in water. I am curious if there is a way to have really accurate tests performed for things not covered by my trusty TF100.