Accuracy should lead your comparison, but one number cannot tell the whole story. Review published accuracy results across low, normal, and high glucose ranges. Check whether testing used laboratory references and independent evaluations. A meter may perform differently when strips are stored in heat or humidity. In daily use, compare readings with your clinician’s advice rather than reacting to one unusual result. Small delays matter.

Sensors add another layer. A continuous sensor estimates glucose between readings, so it may lag behind blood glucose after meals or exercise. Look for wear time, warm-up duration, replacement needs, and clear error messages. An app should display trends without hiding raw readings. Useful features include adjustable alerts, meal notes, exportable reports, and secure account recovery. I prefer simple screens, although “simple” is subjective and easy to misjudge during a stressful low reading.