The technology used in the Nissei DM-3000, to measure blood pressure, is among the best rated for accuracy by Medaval Ltd. It has passed in two validation studies, between general and specific populations, according to recognised standard protocols, as published in peer-reviewed publications.
Tasker F, De Greeff A, Shennan AH. Development and validation of a blinded hybrid device according to the European Hypertension Society protocol: Nissei DM-3000. J Hum Hypertens. 2010 Sep;24(9):609-16. Epub: 2010 Jan 28. doi: 10.1038/jhh.2009.113. PMID: 20107491. Available from: www.nature.com/jhh/journal/v24/n9/pdf/jhh2009113a.pdf.
ESH-IP:2002 - Pass General population
Stergiou GS, Karpettas N, Kollias A, Destounis A, Tzamouranis D. A perfect replacement for the mercury sphygmomanometer: the case of the hybrid blood pressure monitor. J Hum Hypertens. 2012 Apr;26(4):220-7. Epub: 2011 Sep 8. doi: 10.1038/jhh.2011.77. PMID: 21900952.
ESH-IP:2010 - Pass General population (Note: Modified protocol)