It may seem gimmicky but this iLevel, designed by ID firm Cardboard Helicopter for client Franklin Sensors, is brilliant. It's a 12" level that turns green when it's perfectly level or plumb.
This is not only easier to see than gauging the bubble—particularly when you're at an angle relative to the window—but means you can see it from a distance.
It's also useful in low-light situations.
They run $25 a pop and get rave reviews.
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