Brief introduction: Taiwan's SUNTEX online conductivity/resistivity monitoring instrument EC-4100, with external dimensions of 96 * 96 microcomputer design, large LCD display screen, with operation status and special symbol display LED light signal indication warning, cleaning action status with automatic and manual range switching, accepts two pole and four pole electrode input combination keys to enter the setting and calibration mode design, prevents erroneous changes, provides electrode automatic cleaning device contact program setting output, widely used in RO, pure water, ultrapure water, circulating water, boiler water and other systems, as well as electronics, electroplating, chemistry, food, pharmaceuticals and other fields