Hach is not primarily focused on Smart Cities and Buildings. Their core business, as evidenced by their website, is water analysis. Therefore, a writeup about Hach as a Smart City/Building company is not possible based on publicly available information. Their expertise lies in providing instruments, software, and services for water quality monitoring and management across various sectors, including industrial, municipal, and environmental applications. They do not appear to have a significant presence or offerings directly within the Smart Cities and Buildings market.