Leaving the magnetic stirrer running is fine, that is what you are expected to do.
I'm not sure exactly what you mean by "I stoppedmeasuring when the FC reading was above that". You need to complete the FC test, and have the sample turn clear, or the CC measurement is not valid.
When doing any of the tests, it is important that you hold the dropper bottle vertically and squeeze gently so a drop forms on the tip and then falls off from gravity, not from spraying out.
I'm not sure exactly what you mean by "I stoppedmeasuring when the FC reading was above that". You need to complete the FC test, and have the sample turn clear, or the CC measurement is not valid.
When doing any of the tests, it is important that you hold the dropper bottle vertically and squeeze gently so a drop forms on the tip and then falls off from gravity, not from spraying out.