Promaster Bubble Level - 2-Axis

The two bubbles are easy to read at a glance, and it sits snug in the accessory shoe without wobbling. It’s so light I forget it’s on the camera until I need to level a horizon.

I was worried it might feel cheap, but the bubble vials are crystal clear and the whole thing is rock solid in the shoe. For the size and weight, it's surprisingly accurate for leveling horizons and vertical lines.

Slid this into my camera's hot shoe and instantly had a solid reference for leveling horizon shots. It's tiny enough to leave on the camera, and the bubbles respond quickly to adjustments.