The Thomas fluorescent antibody microscope slide measures 1 x 3" and has two etched rings, each with a known diameter for counting. It has a frosted glass end on one side to accommodate labeling with a pencil or marking pen. The package contains 144 slides. This glass slide is used for performing indirect fluorescent antibody tests.

Thomas Scientific manufactures instruments, equipment, supplies, and chemicals for laboratory and scientific applications. The company, founded in 1900, is headquartered in Swedesboro, NJ.