Description
Mantis Magnet Viewer – Ms-017 — Magnetic magnifying viewing portal for aquarium glass
Looking at a reef or planted tank through the front glass still leaves a layer of algae film and glare between the eye and the detail, and a handheld magnifier cannot be held steady for long. Mantis Magnet Viewer – Ms-017 (SKU: MA069805) is a magnetic viewing portal built with an optical-grade magnifying glass lens, held in place on the aquarium glass by its own magnets rather than a suction cup or a hand. The viewing portal is about 10 cm (4 in) across, large enough to frame a coral head, a fish or a cleaning crew without constantly repositioning the unit, and once attached it stays put for extended viewing or photography sessions.
The lens has a focal range of about 7.5 cm (3 in) from the glass, which is the working distance at which the magnified image comes into sharp focus, and it is intended to bring out detail on corals, fish and other aquatic life that is easy to miss through plain glass or acrylic. Like other magnetic aquarium tools, it is rated for a maximum combined glass thickness of 12 mm, so it holds securely on standard display tanks but should not be relied on for thicker glass without checking the fit first. Because it mounts externally on the outside of the tank, it adds no equipment inside the water and can be moved to a different spot on the glass at any time to follow a fish or a coral as it grows.
Usage & Application
When to Use
- Close observation: Checking coral polyp extension, fish condition or cleaning crew activity in detail.
- Aquarium photography: Holding a steady, magnified view in place while a photo or video is taken.
- Everyday viewing: Fixed to a favourite spot on the glass for regular close-up looks at the tank.
- Standard display glass: Any tank with combined glass thickness up to 12 mm at the viewing point.
How to Use
- Clean the glass: Wipe algae film from both sides of the pane where the viewer will sit.
- Position the lens: Hold the outer half against the glass opposite the inner magnet piece.
- Let the magnets engage: Bring the two halves close until they lock together through the glass.
- Adjust as needed: Slide the unit along the glass to frame a different coral, fish or angle.
Product Specifications & Highlights
Key Features
- Optical-grade lens: A magnifying glass intended for clear, detailed viewing.
- Magnetic mounting: Holds in place on the glass without a suction cup or hand support.
- 10 cm viewing portal: A wide enough window to frame a coral head or fish without repositioning.
- 7.5 cm focal range: The working distance at which the magnified image is sharpest.
- External fit, no tank intrusion: Mounts outside the glass, adding nothing inside the water.
Product Details
- Brand: Mantis
- SKU: MA069805
- Product Type: Accessories > Magnetic Viewing Portal
- Viewing Portal Size: About 10 cm (4 in)
- Focal Range: About 7.5 cm (3 in) from the glass
- Maximum Glass Thickness: 12 mm
- Material: Optical-grade magnifying glass lens with magnetic mount
- Target Environment: Freshwater and marine aquariums


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