Garmin Index BP Monitor

Anyone have this? I have a cheap Omron one from Walgreens or something. Like to check once a week or so to make sure I’m not dying. I’m already in the Garmin ecosystem so makes sense to buy if it’s a high quality device. My issue with my current one is I can sit to take a measurement and get pretty big variance if I take back to back readings - like a range of 10 on systolic number. I try to make sure I’m doing it the most correct way.