Catch them if you can....
Test Targets are on sale for few more hours only: https://amzn.to/47sXpoF . Note the best deal: 35 mm and MF test target as Combo - for US$40 it's a steal 😉
USAF 1951 Resolving power chart on film - powerful tool for 35 mm, type 120 and 4x5" film scanning
Start with Digitize your film article.
The targets are available on Amazon.com with free Prime and in Freestyle Photo