Quote Originally Posted by Weedhound
Well his meter only reads to 1990 so he's going to have a hard time calibrating it to 2190.
LOL...ooops. I was tired and a bit distracted.

If it's the basic meter i'm thinking of it reads at a 0.7 conversion scale and is calibrated by sticking it into "something with a known tds number" or what not and calibrated to that.
I've also got the basic one, so I looked up the TDSTer11 before I posted. It's got a lot more bells and whistles than the basic one does, including the ability to adjust the conversion ratio.

I don't see anything on mine that switches to a 0.5 conversion and nothing in the instructions either so I'd be interesed to know if that actually works although I doubt I would change at this point because I'm really used to the 0.7 now.
You sure it's 0.7? Damn, I've been running under the belief that mine was 0.5 all this time. That might explain why my plants get nute hungry about half way through flowering
Help_Needed Reviewed by Help_Needed on . TDS Meter Calibration Issues I'm hoping that there are some really smart folks out there that can help me understand something of the world of meter calibration. After making my purchase of an Oakton TDSTestr11, I asked the young genius behind the counter for an appropriate calibration solution, for which he hands me General Hydroponics Standard Calibration Solution. Here's where the confusion starts, as the package indicates that it calibrates to 1500ppm (NaCl), 2190ppm (442), and 2930S (microSiemens). So everything Rating: 5