ppm meter settings question

I have a sunleaves tds expert, and it has 3 different settings to use when testing ppm: KCI, 442, and NaCl. Which one should I be using when checking ppm?

Weird Jimmy 420 said:

I have a sunleaves tds expert, and it has 3 different settings to use when testing ppm: KCI, 442, and NaCl. Which one should I be using when checking ppm?

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I have a MH meeter with that and also those in EC...... from what I got from the manufaturer those are just the calibration standards used. and from the nute maker, I was told to use KCl. Now the bigger question? what conversion does it use the .5 the .62 or the .7 most people on here will quote PPM based ont the Truncheon scale(.7) and if your meter is based on Hanna (.5) you will burn the HECK out of your plants, dont ask me how I know that

hope that helps