9 Industrial process control measurement instruments, namely, flow switches, flow meters, flow sensors, pressure switches, pressure transmitters, pressure sensors, level switches, level transmitters, level sensors, temperature switches, temperature transmitters, temperature sensors; Liquid analysis instruments, namely, pH meters, pH sensors, pH transmitters, conductivity sensors, conductivity transmitters, oxygen sensors, oxygen transmitters, turbidity sensors, turbidity transmitters; control unit and indicator for use in industrial process control