AWESOMELY QUICK REPLY!!!! THANKS!!!!!!!!

I've been reading the three PPM readings: KCl, 442, and NaCl and averaging them to find my estimated PPM. Since the ppm are different on each reading, I've been wondering about this on a N-P-K basis. I'm using latewoods GH 3-part nute sched, but am getting slight browning/yellowing of the bottom leaves and would like to know exactly what my ppm is, instead of looking at six total readings.... 442 is now at 1100, yet KCl and NaCl hover around 800. TDS reads around 1400.

Wish I had an EC stick....