Which scale to use for tds meter

Which is the ppm scale measurments everyone is referencing to online naci kci or 442? Which one I should be using

I use kcl


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pya said:

Which is the ppm scale measurments everyone is referencing to online naci kci or 442? Which one I should be using

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I've used mostly the 442(700) for long time. That doesn't make it any better to you because I do though.
What ever one you get, understand what that conversion factor is, so when you post about ppm #'s on forums, you can also tell them at what conversion factor that ppm# is based off of

Or look at a chart and convert it to EC, so when you post online you can use the universal EC instead

Or get a meter that does EC, or, some are switchable between .5, .7, and EC.

I used 500 (TDS) for the longest time. But ec is universal. 700 just hurts my brain. Therez actually another one i believe...650 or some shit. Confusing to say the least. EC and 500 (which is half of ec without a decimal) works for me.