![Does anyone Have a conversion table From 700 ppm to 500 ppm scale? - Grow Room - I Love Growing Marijuana Forum by Robert Bergman Does anyone Have a conversion table From 700 ppm to 500 ppm scale? - Grow Room - I Love Growing Marijuana Forum by Robert Bergman](https://aws1.discourse-cdn.com/growingmarijuana/original/4X/c/4/d/c4d81fb21a3f6ff03fec2079cfd4ddcb83fbcc96.jpeg)
Does anyone Have a conversion table From 700 ppm to 500 ppm scale? - Grow Room - I Love Growing Marijuana Forum by Robert Bergman
![Establishing a conversion factor between electrical conductivity and total dissolved solids in South African mine waters Establishing a conversion factor between electrical conductivity and total dissolved solids in South African mine waters](http://www.scielo.org.za/img/revistas/wsa/v41n4/08f07.jpg)
Establishing a conversion factor between electrical conductivity and total dissolved solids in South African mine waters
![Dayons Professional TDS & EC Meter- Water Purity Tester with Leather Case Having TDS:0-9990ppm,Degrees Celsius:0-80.0'C : Amazon.in: Industrial & Scientific Dayons Professional TDS & EC Meter- Water Purity Tester with Leather Case Having TDS:0-9990ppm,Degrees Celsius:0-80.0'C : Amazon.in: Industrial & Scientific](https://m.media-amazon.com/images/I/61MaQEtKZpL._SL1021_.jpg)