This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
NIOSH NMAM b. en Image found within the text of Method in the NIOSH Manual of Analytical Methods File NIOSH Manual of Analytical Methods pdf National Institute for Occupational Safety and Health other versions PDUSGov National Institute for Occupational Safety and Health publications
Page 2023 Free-images.com. All images are Public Domain