Blood pressure readings depend on a lot of factors such as stress levels, the food or drinks you have eaten, activity levels, time of the day, room temperature. So, if you are observing varying BP Monitor readings at different times then it is completely normal. Just ensure to keep all these things in mind before taking blood pressure measurements:a) Avoid drinking, bathing, eating, smoking, exercising, and caffeinated beverages 30 minutes prior to taking measurements. It is also recommended to take a rest of at least 15 minutes before taking measurements.b) Make sure your body movement is correct and avoid any movements while taking the measurements.c) Ensure you are using the cuff correctly and try to take the readings at the same general time every day.