title: Reach distances between two horizontal photoelectric beams.
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D004560:Electricity; D004869:Equipment Safety; D006804:Ergonomics; D005260:Female; D006225:Hand; D006801:Humans; D008027:Light; D008297:Male; D008875:Middle Aged; D011482:Protective Devices