Measuring tool: make or buy?!

Hello!! I saw this video where someone was using a tool to measure on their glow forge to make sure it was the right height without the basket in. Does anyone know where I can get this tool? Or have a file so I can make the tool myself?!? Thanks so much! Added a pic of the tool

Thanks for asking – yes, you can purchase the file direct from the GF Catalog:

You need to buy it. I have it and find it indispensable.