Optical grade magnifying lens with 5 viewing portal is perfect for aquarium photography Held in place by strong rare earth magnets Great at checking for any early signs of disease or pests on your reef coral shrimp or fish! Designed for all Tanks. – Freshwater, Saltwater or Dry Deep See is Safe for both glass and acrylic!

• Focal range approximately 3 to 12 inches.
• For use on tanks up to 3/4 (20mm) tank wall thickness
• Easily moves around the tank for viewing from any location