Name to be updated. 

A simple board with markings every 1cm on both the X and Y axis. 

used to show the size of objects after printing to give a sense of scale when taking photographs. 

I'm sure there is a proper name for this type of thing.

I made it quite thick simply to ensure it stays solid whilst I move it around / use it. 

printed face down to keep a flat surface and so no need to worry about ironing settings. (unless you want to)