Siemens Water Technologies offers two options for measuring the water product quality from your DI or high purity water system: End of deleted content Start of deleted content5-Range quality indicator light End of deleted content Start of deleted content- offers 5- convenient resistivity/conductivity ranges and uses a highly visible LED indicator that changes from green to red when the product water quality falls below selected cutoff point. End of deleted content Start of deleted content Hy-Lite water quality indicator End of deleted content Start of deleted content- monitors DI water quality at the DI tank or up to 700 feet away. Features audible alarm, steady green or flashing red LED display and five set points.