Enhance your aquarium experience with the Flipper DeepSee Clear 4″ Magnified Viewer. This top-quality optical grade magnifying lens provides a 4-inch viewing portal, perfect for capturing stunning aquarium photographs. With a focal range of approximately 3 to 8 inches, it allows you to examine every detail with crystal-clear precision. The DeepSee viewer is secured by strong magnets, making it suitable for tanks with a glass or acrylic thickness of up to 5/8″ (16mm). This innovative design allows you to easily move the viewer around the tank, offering flexibility to view your aquarium from any location. This viewer allows you to easily check for early signs of disease or pests on your coral or fish, making it a versatile addition to your reefing toolkit.