What tds readings is everyone using?

I just wanted to see what conversion factor everyone is using. I have a bluelabs truncheon that reads both .500 & .700. I just wanted to see which one is more commonly used and why.

I mixed my hydro nutrient solution yesterday and my final tds for .500 was in between 300 & 400 ppm and the .700 was like 100-150 higher than the other. Any comments or clarification. My original ppm of water was in between 100-200 ppm on .500 before i added nutes to my 2 week old seedlings.
Thanks!

I dont know. I use PPM, which i believe is the .5 of ec ? cant remember, dont really care. i jus use it as a reference number anyways. for me regular is 400-500 ppm, if i want a higher dosage i bump it up to like 700-800. After mixing up the jugs for as long as i have been. I dont even need to bust out the meter anymore. I might once in a while just out of curiosity. same goes for my Ph pen. i think i just use them to make sure they still work.

I think most so called "Pro" growers prefer ec over .5/.7

I use 1200 ppm during flower 800 to 1200 during veg ...

If everyone communicated in EC we no one would ever be confused by this again. PPM is the result of multiplying EC by .5,.7 etc.

Cuebossa said:

If everyone communicated in EC we no one would ever be confused by this again. PPM is the result of multiplying EC by .5,.7 etc.

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So my 2 week old seedlings at 300-400ppm at the .5 conversion factor is probably fine?

Depends on the medium you are growing in and the fertilizer you are using.

I am using hydro. Hydroton is medium. I mean it is two readings. Which one do you use conversion factor .5 or .7. You could use both anytime you take a reading of your nutrient solution.

I don't use conversion factors. I go by EC. 300-400ppm @ .5EC is .6-.8EC