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Despite the widespread use of automated self-measurement monitors, there is limited published evidence on their accuracy and reliability on different patient groups. The objective of this study was to evaluate the accuracy and reliability of the Omron M6 (HEM-7001-E) upper-arm blood pressure (BP) device against mercury sphygmomanometer on elderly patients according to the criteria of the International Protocol.Thirty-three patients above 65 years of age, who were classified based on the BP categories of the International Protocol, were recruited for the study. BP measurements at the upper arm with the Omron M6 were compared with the results obtained by two trained observers using a mercury sphygmomanometer. Nine sequential BP measurements were taken. During the validation study, 99 measurements were obtained from 33 patients for comparison. The first phase was carried out on 15 patients and if the device passed this phase, 18 more patients were selected.Mean discrepancies and standard deviations of the device sphygmomanometer were 1.4±5.3 mmHg for systolic BP (SBP) and −1.4±4.5 mmHg for diastolic BP (DBP) in the study group. The device passed phase 1 in 15 patients. In phase 2.1, from the total 99 comparisons, 76, 92, and 97 for SBP and 77, 94, and 99 for DBP were less than 5, 10, and 15 mmHg, respectively. The Omron M6 passed phases 2.1 and 2.2 in the elderly group of patients.The Omron M6 (HEM-7001-E) upper-arm BP monitor passed according to the International Protocol criteria and can be recommended for use in elderly patients.