The Yorkshireman
Well-Known Member
They both do the same, they just use different units of measurement.ok m8 think i brought the wrong pen tho as ive just look ive brought a tds shouldnt i of got a ec pen ?
TDS = Total Dissolved Solids.
EC = Electrical Conductivity.
PPM = Parts Per Million.
The proper scientific measurement and the standard to use is EC.
If your pen measures in one of the other 2 ways then you'll need to find a conversion chart on the web to correlate between TDS, PPM and EC.