Some of us have added a bigger chart to the top of the TF100 to record not just test data but chem additions and other comments. I keep those in a file so that I can go back and review when the chlorine consumption got higher.
It won't take long, however, for you to develop an eye for the pool. When it is just a bit dull, you know you need to test and see what is up, before you get any algae started. Daylight, rain, usage, pollen, leaves, filter run times all can affect the pool, not to mention what happens when you get lazy and stop testing or adding chlorine for awhile like over the winter.
I tend to forget about testing for weeks at a time over the winter if we haven't used the spa. In mid February I will notice the pool is a little dull and if a few days of normal chlorine is not enough I will shock once to get the sparkle back.