Yes, as long as your blood pressure remains within normal ranges, the variation is normal and even expected. Your blood pressure depends on what you do and consume at the time of, and slightly prior to, conducting the blood pressure test. It also depends on your health condition and whether or not you are on any medications (as some medications can slightly lower or raise your blood pressure). This also ties in to why it is so important to continuously monitor your blood pressure at home. It is also important, if you are on blood pressure medications, to track your measurements and see if the medication has been effective so far or not. For optimum results, make sure that you are using all the components of the device correctly, that you are conducting the test properly, the equipment is well calibrated, and that you are not caffeinated or have just exercised prior to the test.