tds meters on ebay

[zeebo]

I know this subject has come up before, but just wonder if members willing to share which is easier and I consider the expense. Hanna Primo , or HM ? want the easiest one to use . Anyone have experience with either of these ? appreciate .

 

[Irene0100]

I have one from ebay but no idea what make, its just a cheap one.

 

[dw1305]

Hi all,
I'd go for the Hanna, but conductivity meters are the one electronic meter where they all work, and don't need constant re-calibration and you can just dip them in and get a meaningful reading.

You ideally want a low range model (0 - 999 microS). They all read conductivity and then use a constant to convert conductivity to ppm TDS. This is usually either 0.5 or 0.62, but if you go with 100 microS = 55 ppm TDS you won't be far wrong.

cheers Darrel