I made this wound trackers out of MDF, designed in illustrator. Next version I need to make the numbers on the little one upside down so you can read them from the front - d’oh!
I might also suggest instead of a hole to look at the numbers you try a U shape - because often you can’t get directly over your pieces so you’d be trying to view it from the edge of the table 2’ away (may not matter if you’re tall, would totes matter to me!)