A&D Medical Blood Pressure Monitor (UA-651)
This particular model is from a reputable brand and has been tested and validated for clinical accuracy. You can explore other options on the AMA website that lists all the current brands that they have validated. We recommend using a cuff that has been validated by ANSI/AAMI/ISO 81060-2: 2018 or newer.
Here are some websites that can help you determine if your blood pressure monitor is a validated model:
https://medaval.ie/resources/EN/devices/AD-UA-651.html
https://www.validatebp.org/device/essential-blood-pressure-monitor-2