A glucometer gives you an instant blood glucose result. Writing test results in a log book and comparing them over time can show you and your healthcare professional if your diabetes management program works for you or needs to adjust. Maintaining your logbook with updated results is also a great way to see how daily events like meals and exercise impact your blood glucose over time. For your convenience and to encourage better diabetes management, we provide the OneTouch Log book for you and your healthcare professional. The size of the OneTouch logbook is similar to a checkbook.