Monitoring blood sugar level is important for diabetics, as different factors like food, exercise, stress, and medications could cause them to change. With a glucometer, diabetes management will be easier as you can track the fluctuations in blood glucose levels. You can buy a glucometer online , and you will be surprised with the wide array of options available. They range from basic units to highly advanced and sophisticated devices with plenty of features and options. They vary in cost and the test strips, too, so it is important to know your options and these factors to make an informed decision: How it works Before you buy a glucometer online , take ample time to know in detail about their basics; particularly how they work. You need to insert a test strip in most of the meters to draw blood; you have to poke a clean fingertip with a special needle and touch the test strip to take out the blood. After this, you should wait for the blood glucose reading to be displayed