42 Rental of electronic machines, apparatus in the nature of computers, computer hardware and computer peripherals, measuring apparatus and their parts, other than electrostatic copying machines, electronic desk calculators, electronic dictionaries and word processors; rental of computers; server hosting; electronic data storage; providing temporary use of non-downloadable computer software for database management on data networks; rental of web servers; rental of measuring apparatus; rental of measuring and testing machine and instruments, namely, computers; rental of electric and magnetic meters and testers; software as a service (SAAS) services featuring software for monitoring, recording, and analyzing use of water purification equipment, machines and plant; software as a service (SAAS) services featuring software using artificial intelligence for monitoring, recording, and analyzing the used, use and usage of water; hosting computer websites; rental of computer software; platform as a service (PAAS) featuring computer software platforms for monitoring, recording, and analyzing use of water purification equipment, machines and plant; platform as a service (PAAS) featuring computer software platforms for water treatment services in the nature of designing, constructing, operating, maintaining, managing, and aiding in inter-facility coordination of water treatment equipment, machines and plants, sewage treatment equipment, machines and plants; maintenance of computer software; computer software design, computer programming, or maintenance of computer software; monitoring of computer systems for water purification; designing of machines, apparatus, instruments including their parts or systems composed of such machines, apparatus and instruments; technological advice relating to computers, automobiles and industrial machines; testing the functionality of and research on machines, apparatus, and instrument; calibration measuring; consultancy in the field of energy-saving measurement to improve energy efficiency, namely, technological consulting services in the field of water treatment industries; water analysis; research in the field of telecommunications technology; quality control of services; energy auditing