Most People Don't Know the Function of This Construction Equipment. Do You?

With its cutting-edge design, this tool serves a unique purpose—can you guess what it is?

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Correct Incorrect The most widely used version of the laser level was patented in the late 1990s, though an earlier model was patented in the late 1980s. The concept for a laser level had been around since the early 1970s.

With its cutting-edge design, this tool serves a unique purpose—can you guess what it is?

• Blinds crew workers.
• Uses a laser to measure level angles.
• It's a time clock.
• Used as a paper weight.