Thanks for all the responses.
Unfortunately,i didn't get a satisfied answer to:what is the reason that the voltage doesn't stay constant/why does it decreases the following next seconds and what does it mean(good,not good)?
Graham mentioned number of reasons for the decreasing:
Quote:
Originally Posted by Graham
There could be a number of reasons for the voltage to drop. Gas forming on electrode, corrosion inhibitors doing their job, passivation of the electrode
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But they are only possibilities.what is the true reason?
What is it mean?
I would like to understand the issue,it is not just to know if the coolant is good or not .
I can check the coolant,also,with PH strip as other mentioned.
But this is not my main reason for my question.