[mmfish]

In using the American Marine conductivity meter it reads in units of micro seimens. Easy conversion to DH, KH?

 

[Jeffww]

I don't think you can convert to those units without some other measurements. Conductivity does convert to SG easily if I remember correctly. Conductivity is simply a measurement of ion concentration. Nothing else. You can't determine without some other measurements the difference between any ions as you would need to know that for KH or GH measurements.

 

[Wasserpest]

What numbers are you getting? My tap water is ~0.60 mS, my tank water between ~0.85 and 1 mS. That's milli Siemens.

I think there is a way to convert the EC values into TDS, but not KH or GH.

 

[adchemist]

You can use the approximation that 2uS/cm = 1ppm, but that is for all ions in solution not just those contributing to water hardness. There is inherent error in that approximation.

 

[mattycakesclark]

+1. TDS is approximated via conductivity (uS/cm) as said above. Some meters will allow you to switch from TDS to conductivity units. kH and gH are not all that contribute to conductivity. A separate testing kit is needed.