Also, try not to move it around, I recommend leaving it right next to your humidor, that way you it's in basically the same temp range as your cigars. Rh fluctuates with temperature, but very small deviations. I suspect just the moving about of the test, or the test not sealed completely are factors in our inconsistent readings.

I know it's hard, but try not to get to OCD over humidity... just get your hygrometer close, and don't lose a lot of sleep over it... four or five points either way aren't going to make much of a difference. The way your cigars are smoking is a fine way to determine if storage conditions are adequate. It's really not "Rocket Surgery"