SHOW OFF YOUR TANK! 4" DeepSee Magnetically Mounted MAGNIFIED Aquarium Viewer by FL!PPER Aquarium Products. Optical grade magnifying lens is perfect for aquarium photography! Magnifying lens attaches on the outside of the tank and is magnetically mounted through the walls of the aquarium by strong rare earth magnets for use on tanks up to 5/8" (16mm) wall thickness. Features: * Optical grade magnifying lens, PERFECT FOR AQUARIUM PHOTOGRAPHY! * Great for monitoring fish and corals for disease or stress * Deep See is Safe for both glass and acrylic tanks * 4" Viewing portal lens with focal range approximately 3 to 8 inches * Held in place by strong rare earth magnets for use on tanks up to 5/8" (16mm) tank wall thickness * Easily moves around the tank for viewing from any location

• Show Off Your Tank! Optical grade magnifying lens is PERFECT FOR AQUARIUM PHOTOGRAPHY!
• Magnifying lens attaches on the outside of the tank and is magnetically mounted through the walls of the aquarium by strong rare earth magnets
• Easily moves around the tank for viewing from any location | Great at checking for any early signs of disease on fish or unwanted pests!
• Safe for both glass and acrylic tanks or any glass enclosure habitat with up to 5/8" (16mm) tank wall thickness
• 4" Viewing portal lens has a focal range approximately 3 to 8 inches