photo reference scale

this small ruler can be used as scale reference while taking pictures of your archaeological find - erm - your latest thingiverse design ;-)

based on this 2d-print photographic reference scale by Jim Elder

features:

• overall size is ~10x~2cm
• several centimeter squares and millimeter ruler for reference
• a 2cm diameter ring for perspective correction
• a gray area for color correction
• mounting holes (for your keyring, backpack, ...)