conmet 1 conductivity meter
 

conmet 1 conductivity meter
I was given one of these meters a while back, but I've never used it.
My questions are simple really......
What does the reading tell me about my tank? Does it indicate salinity or TDS, and if so, what can I do to with this info to maintain parameters etc. (and what indeed are the parameters involved?)
I tried Googling it, bt there's too much chemistry stuff to filter out any useful information.
Thanks,
K