Not sure what your monitor size is ?
Monitor Size: Unknown
Weigh it multi use advanced digital luggage scale
10 cm ruler
Neocube magnet bead
just about right on my 1069 inch computer...
I measured with a ruler... and it was spot on.
Sorry, I said the image was wrong when actually it was my mistake. I put 19'' instead of 21''.
Yay! So helpful guys! Really improved my Pokemon Go!!!!