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No difference for what you will be using it for.

Any battery hydrometer will work but here is a link to ACE hardware it has the temperature compensation on it.

http://www.acehardware.com/product/index.jsp?productId=1292142

Now the cheapest...

I am not sure but a few years ago when I looked into it, the concentration we are using were not on the scale or when it did it was to expensive. Do some research and let us know what you find. I...

Thank you this will help in understanding what is going on.

No I do not. If I remember I could not find one that would read in the range I needed but I could be confusing with something else.

I do not really need pictures of the reactor but would like a detail explanation of the how it is built. Tubs, plates, wire, type of electrolyte, and type of water like well or city or distilled...

James, can you describe in detail what kind of reactor you are using. Pictures would be better though.

Couldn’t you use the throttle position sensor to control your PMW? It is easy to mount if the car does not have one and cheap. Most newer cars have them.