There are lots of glucose monitors out there to choose from, ones that are invasive, non-invasive, and continuous, and it all depends on personal preference and lifestyle.
An invasive blood device requires you to draw a very small amount of blood to apply to the test strip, which you’ll have to remember to do multiple times per day.
There’s a minimally invasive variety that you use to scan the area, like your arm, to get a blood level reading instantly; however, the sensors might not always stay in place to form an accurate reading.
Then there's a continuous glucose monitoring device, which continually gives you readings - it requires minimal effort, perfect if you don’t always remember to take your blood sugar levels.