Print Bed First Layer Adhesion Calibration

I wanted a first layer test that covered most of the printer bed, without having to copy and place each piece every time in my slicing software. I also wanted an internal feature, so I added holes.
The squares are 10mm a side, and 0.4mm tall, with a 5mm hole in the center.
The circular disks are 10mm in diameter, and 0.4mm tall, with a 5mm hole in the center.
If your slicer can scale parts, you can adjust the Z to whatever you want, as 0.4mm may not match your layer height.