PPM Scale.

When you are talking abut ppm; Are talking abut the 500 scale or 700?

Kisskorv said:

When you are talking abut ppm; Are talking abut the 500 scale or 700?

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Depends on the nutrient Company they all use a different scales. I use ec instead.

Most people on this site go by 500

It depends on brand of meter and so on. It's hard to assume what scale they're using. Either way they are kinda close but I prefer EC for this reason.