Drag each colored dot to the exact corner of the picture panel on the box lid.
Red = top-left Blue = top-right Green = bottom-right Yellow = bottom-left
When the dots are perfectly on the lid corners:
Read me the 4 values shown in the box above — TL(x,y) TR(x,y) BR(x,y) BL(x,y) — and I'll lock them in immediately.
Open /calibrate in a new tab for easier switching