ec is double the number of ppm... i.e. 500ppm = 1 ec, 900ppm equals 1.8 ec.... ec... etc....
Illusion Reviewed by Illusion on . EC and PPM I bought a EC/PH handheld meter from Hanna and I recalibrated it using the provided solutions. My ph was set correctly and using the EC solution it registered what the package said should be the correct number. I read this forum a lot and everyone always uses PPM when referring to the amount of nutrients they use. This causes me some concern because when I used my ppm scale on the meter in the test solution it didn't read near the 1500 ppm I assumed that it was going to read. HOWEVER it did Rating: 5