I wouldnt mind having a reliable conductivity meter. Is the A122 model the current version similar to yours? Checking Thermo Fisher on this link.It is likely a fine device. I had one that was accurate, but I will note that some people touting the accuracy have never actually verified if it is true or not.
But they have substantial drawbacks and I think conductivity meters are much more user friendly option. Temperature corrections needed, the fact that it needs deep water to float in, cannot be used in otehr settings (such as limewater potency),and the fact that it is not easy to read at a glance while doing other things (say, when acclimating new creatures) made me rarely use mine.
I use and liked an Orion Model 128 conductivity meter with a 4 electrode probe.
Conductivity Meters | Thermo Fisher Scientific - US
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