TDS meters

[ScotJudd]

I regularly test Kh and Gh. I aim for a reading of 6 degrees of each. Would there be any advantage in using a TDS meter, would that not just tell me the total hardness and not the balance of Kh and Gh (eg. Kh could be lower and Gh higher and still get the same result as Kh and Gh being equal).

 

[Delapool]

As I understand this it is everything dissolved. I've been thinking of getting one out of interest (also redox). I think my water change schedule and test kit handle/measure most stuff so this is a nice to have but honestly don't know.



http://theaquariumwiki.com/TDS

http://www.theaquariumwiki.com/Redox

Edit - also they are only a few bucks on eBay quickly looking. I got caught with the ph meter though that I had to buy more calibration solution