... specificationProtection range, 0-8000mm;SpecificationSNBxx20 (xx=06, 08, 10, 12......72)SNBxx30 (xx=06, 08, 10, 12......72)SNBxx40 (xx=04, 06 ... , 08, 10......72)SNBxx80 (xx=02, 04, 06, 08......20)Light axis pitch 20mm, 30mm, 40mm ... should be made on order; Cost-effective safety device,light barrier sensor SNB3230