Test strips for coolant

[RocketScott]

I use the Cummins DCA-2 when adding new coolant. Also use it in my van with a 7.3L IDI engine since it doesn't have a cooling filter to maintain the charge

I got a half gallon of it at Fleet Pride years ago

As far as other additives like water wetter or whatever I've never tried any of them. Never had an issue with a properly functioning cooling system