SEA SUCKER

FLEX-X PHONE MOUNT $85; seasucker.com HOW IT WORKS

As the name implies, the mount employs a 4-inch suction cup activated by a vacuum-pump plunger on the mount. The suction cup adheres on a clean, smooth surface with surprising force. We declined to measure it in our tests for fear of breaking the glass before the suction cup gave out. A red or orange warning ring appears as the cup loses suction, providing a useful visual warning to repump it.

The Flex-X arms are spring-loaded to open and close the rubber pegs securely around the phone. For added security, a rubber lanyard or harness stretches over the corners. Properly secured in the X-grip, the buttons are accessible and the camera is unobstructed. The flexible post can bend to the proper viewing angle, which is best done when the base is secured. The post is stiff, and flexing it attests to the strength of the suction-cup holder.

TIPS FOR SUCCESS: Always clean and wax the surface before adhering, and always store the suction cup in the included protective cover to prevent damage that reduces suction.

TRIALS: We stuck the mount to a window, and 24 hours later, it showed no sign of detaching and no trace of the red or orange warning collar.

SUMMARY: Our suction mount remained firm 24 hours after installation and needed no repumping. But take care: A dirty or scratched surface, or a scratched suction cup, holds suction poorly. The 43/4-inch suction base sacrifices too much visibility, so it needs to be mounted on a bulkhead, hardtop or dash top.