1. On line water quality meter, rugged on line electrodes come with waterproof cable, easy and simple submerse it in water. Electrodes built-in RS485, bluetooth or Wifi. Wide application: Monitoring water quality of aquaculture, agriculture, laboratory, water treatment, Industrial. Electrodes can be calibrated by a calibrator, easy to do the self-calibration. 2. LCD display calibration status ( K value, slope checking, calibration ...etc). 3. Rugged on line electrodes with waterproof cable, one and fixed in electrode, the other end simply submerse in water, electrode at least 1 year. 4. Cost effective and simple rugged submersible economy industrial electrode which integrated iOT technology electrode for water quality monitoring in ponds water or other fishery application. 5. Unique probe built-in WiFi module and replaceable, easy installation with any availabe pod near water source. 6. Easy to search nearby WiFi AP via smart phones or tablets or simply active LTE/2G/3G/4G network mode to auto connect. 7. Conveniently review real time data or historical data and curve by searching ¡¨Water guardian¡¨ from APP Store or Google play store, free download. 8. The cloud plate form software is user friendly to set up ID, time zone, alarm threshold, email address for sending alert message in time.