![]() ![]() Three beam laser levels project a second vertical beam, at 90° to the first. In practice, range often restricts the actual coverage. If there's nothing in their way, those lines will continue, giving you one line all the way around the room horizontally, and another up the wall, across the ceiling, and down the other side. Two beams – one horizontal, the other vertical – will give you a crossing point, at 90°, on your chosen surface. There are two kinds: those that emit two laser beams, and those that emit three. These are arguably the most popular type of line laser because they offer excellent flexibility at a reasonable price. They're often small, so very portable, but low power means they have limited range. They're usually cheap, and if you just need to line things up along a wall – coat hooks, or a picture rail, for example – they're perfectly adequate. Initial leveling is often done with a bulb or bubble, as with an ordinary spirit level. These are the most basic type of laser level, projecting a single beam until it strikes a spot off in the distance (hence, some people call them spot line lasers). The main variation is the number of beams projected, but there are others, so let's look at each in detail. To help you choose the best line laser for your particular task we're going to look at four areas that distinguish these tools:Īlthough all line lasers generate a beam in the same way, there are a few different types. They may also have an audible warning if they're out of level. More advanced models have an internal pendulum and sensors, and are self-leveling. To level the line laser, some basic devices use a bubble, like on a traditional level. It's then concentrated into a dot or line, and projected by prisms or mirrors.Ī laser beam always travels in a straight line, but it's not inherently "level." That light is "stimulated" by an electrical current, increasing the intensity. With consumer items like line lasers, the initial light is produced by nothing more complex than an LED – much like you find in a digital clock. LASER stands for Light Amplification by the Stimulated Emission of Radiation. They're capable of great accuracy and – in the case of eye surgery – tremendous delicacy. Laser beams have gone from being some kind of sci-fi super-ray, to an everyday part of our lives. They're great to show a line when hanging pictures up stairs, for example. A laser line is always straight, but it doesn't have to be parallel to the floor. ![]()
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