I was able to compare this to the one at my Dr's office today. I checked myself after the nurse popped back out the room and was the exact same reading as the nurse had gotten with their professional machine. This is useful information in monitoring your health during the pandemic. This device also monitors my heart rate and that number always matches my apple watch. The read out on the screen is large enough and bright enough too clearly.
I got it for my husband. He needed a hair cut very bad because of the quarantine. We're pretty happy with this machine and it worked as expected. I like that it comes with different settings and you can choose which one you want to use.