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TDS meter: which one ?



I am thinking about buying a TDS meter to monitor 
my RO unit and to take the guesswork out of 
preparing/mixing water for my tanks.  After looking
what is available, I am somewhat confused....

There seems to be different units out there 
measuring different things. For example here is a 
list of TDS tester from OAKTRON:
Choose TDS 1 & 3 for testing water hardness,
hydroponic fertilizer concentrations and chemical
concentrations. TDS 2 & 4 are perfect for measuring
low range-salinity in koi ponds, aquariums,
recirculating systems and anywhere conductivity
measurements are required. TDS10 measures dual range
ppm/ppt. TDS20 measures dual range µS/mS. 

Can anybody shed some light on this? Can anybody
recommend a good TDS tester that is appropriate for
breeding killies? It is my understanding that 
hardness (Kh and GH) is most important. 
So the question is, do I really want a TDS tester, 
or is a hardness test kit good enough?

Any help is greatly appreciated. Thanks.
Wolfgang


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