There's the initial pain from the prick, but then the reminder pain every time you try and use that fingertip while it heals.
Now imagine having to do that regularly, even multiple times a day, and you can see how uncomfortable of a process it becomes.
So thankfully, the Food and Drug Administration (FDA) approved a much less painful alternative for regular and long-term monitoring, if for example, you have diabetes and need to test a dozen times each day.
So rather than lots of fingerpricks, you have to do one on the back of an arm to fit the sensor under your skin.
It's the sensor cost that's most important as the reader should end up being a one-off, reusable purchase.