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There're 2 device units optional--mmol/L & mg/dL, please choose it according to the standard in your country.. Reminder. 1, Batteries are not included in the package because of aviation restrictions.. 2, Please use up the test strips within 3 months once you open the vial.. 3, The expiry date of blood glucose test strips is for 2 years, expiration time is subject to the date of manufacture on the package, kindly note.. Specification. Calibration sample: venous plasma. Test range: 20-600mg/dL (1.1-33.3mmol/L). Test time: 5s. Blood volume: 1μl. HCT: 30-60%. Expiry date: 24 months. Memory: 500 test results. Battery type: CR2032 (No batteries in package). Please pay attention to the package differences, and select whichever you like.