How to read coolant test strips

[Mattman]

My test strips are good till October.
The test strips are a crude way to test in my opinion, but it is quick and easy to do.

I drained my coolant. Removed coolant filter I just put on and poured it out. Reused coolant filter because I didn't have another one. Put 12 gallons of 50/50 coolant back in. Needs about another half gallon to get to Max cold level. 12 gallons cost me $92 at local oil supplier.

Now my coolant shows purple on the strip. May not be as good as a flushing and all that but sure it is better than what I had before.