TDS controllers and water meters hardness calcium clorine - manufacturers cost 7999 rupees

 https://www.amazon.in/HM-DIGITAL-Controller-Warranty-Digital/dp/B0BSWB4YS7?gQT=1

https://hannainst.in/product/tds-mini-controller-0-to-999-ppm-bl983329-2-220vac-output-4-20-ma/