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Any recommendations on makes and models? I saw one on Amazon. But Amazon is falling out of favor with me as I have gotten fakes.
Having worked in a medical lab, we calibrated everything. Any way to know if the tester you buy works and is accurate? I read there are paper testers too.
Right now, I just flush the fluid every three years or before a track event.
It is really just a simple conductivity tester. Kind of foolproof even in cheap form.
A regular ohmmeter could be used to measure resistance, and go from there.
3% water is plenty.
I have seen technical papers that recommend a fluid change at 2 years.