Expedition 65 Flight Engineers Shane Kimbrough and Megan McArthur work on a Floating Potential Measurement Unit.
iss065e257482 (Aug. 16, 2021) — NASA astronauts and Expedition 65 Flight Engineers Shane Kimbrough and Megan McArthur work on a Floating Potential Measurement Unit (FPMU) that will be installed on the outside of the International Space Station on an upcoming spacewalk. The FPMU is a device that measures electrical charges that can build on solar arrays and surfaces on spacecraft for astronaut safety and to promote safe deep space exploration.