Stand right under here

Boy: Is it possible to get a check-up now?
Doctor: Hah, well, I can give you a quick check-up.
let's start by checking your height. How tall are you?
Boy: How tall am I?
Doctor: Yes, one meter 50, 60, 70, centimeters.
Boy: I have no idea how tall I am.
Doctor: Well, then we'll have to measure you.
Please, stand right under here, would you?
Boy: All right. What is this for?
Doctor: This is for measuring. Right under, yes and hmm,
perfect.

-------------------------------------------

stand right under here

What does "right" mean in this sentence?

Does it mean "exactly" or something else?

Thank you