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he On Call® Extra Blood Glucose Monitoring System offers user friendly features for easier diabetes management at competitive prices. The smart and powerful data management is compatible with the On Call® Diabetes Management Software. Additionally, the On Call® Extra is certified to be compliant with the new ISO 15197 2015. Features Fast and Reliable Tiny 0.4 µL sample size 4 seconds to result Clinically proven accuracy at a hematocrit range of 25-60% Audible fill detection reduces wasted strips Easy to Use User friendly design Large display with bold numbers Auto code calibration circuitry in every strip Convenient test strip ejector Premium Features 5 daily test reminders Hypo, hyper, and ketone alarms 7, 14, 30, 60, and 90 day averaging Re-dosing capability within 3 seconds