SHERLOC Cal Target
By providing a set of base measurements that were taken on Earth, this calibration target will help fine-tune the settings on the Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals (SHERLOC) instrument carried aboard NASA's Perseverance Mars rover. There are 10 kinds of materials on SHERLOC's calibration target, including a fragment of a Martian meteorite and five of the first spacesuit materials sent to Mars. They'll be observed to see how they hold up in the intense radiation on the Martian surface.
For more information about the mission, go to https://mars.nasa.gov/mars2020/.