The L4.7 is a rotary laser aimed at the commercial concrete or general contractor working on large jobs requiring the greatest accuracy. It is an improved version of our time tested L4. This instrument self levels in its horizontal mode via a wire hung compensator, and is manually plumbed in its vertical mode. (The optional W1 wall & vertical mount is necessary for vertical operation.) Compared to other lasers in this price range, the L4.7 is more accurate, has greater working range, is the only laser with vertical capability, and has the longest warranty.
Frequently asked questions
Q: The L4.7 and L4.7 Magnum construction lasers are described as self leveling or automatic. How come I have to turn leveling screws?
A: These construction laser models self level via wire hung compensators. These are gravity pendulum leveling mechanisms that must be rough leveled. Once the instrument is in its self leveling range, the compensator makes sure that the beam is level. The term "automatic" derives from automatic optical levels which employ compensators for self leveling. These auto levels also have to be rough leveled. Servo motor leveling systems have a wider self leveling range and allow the user to turn the laser on without having to turn leveling screws.
Q: Which self leveling system is better, servo motor or compensated?
A: Each system has its pluses and minuses. Servo systems have the appeal of driving the laser to level without the operator turning leveling screws. However, a compensated self leveling laser can be up and running just as fast as a servo system. Well designed servo systems and compensated systems both provide accurate and reliable results. For grade checking and concrete work, compensated systems have been the mainstay for many years. If the laser is going to be used in a situation where it is inconvenient to turn leveling screws, (up on a 14' tripod for machine control), a servo system would be preferable. Servo systems are also less susceptible to vibration.
Q: Can I use a visible construction laser outdoors without a receiver?
A: A rotary laser will have to be used with a receiver outdoors in the sun. Safety regulations do not permit a beam powerful enough to be visible when rotating out in sunlight. If you stop the rotating beam and shine it onto a shaded target, you can use it as a reference, but this is not that convenient.
Q: What kind of working distance do your laser systems have?
A: Using the R8 laser receiver, the Alpha XD and AS2 Magnum lasers have a 3300’ (1km) working diameter. Paired with the R7 laser receiver, the L4.7 has a 1500' working diameter, the L4.7 Magnum and AS2 lasers have a 2000' working diameter. The L6 and L3 lasers provide a 1000' diameter with the R7 laser receiver.
Q: How often should my laser be calibrated?
A: Lasers should be calibrated when they are not shooting their specified accuracy. We suggest checking calibration regularly, at least every 6 months, or immediately if the unit has been treated roughly.
Q: Can I set a grade or slope into the laser?
A: You can set a precise slope with the AS2 and AS2 Magnum lasers. You can “slope match” between existing elevations with both Alpha models and the L6 laser. You cannot set a slope with the L4.7, or L4.7 Magnum lasers. The L3 laser features a manual vial with markings for 1, 2, 3, or 4% slope.
Q: Where can I get my construction laser serviced?
A: Almost any laser or survey instrument service center can calibrate our lasers, or the user can do so if he/she so desires. Many of our 400+ dealers in the US have some service capabilities ranging form calibrating lasers up through full repairs. Lascolaser.com has a full service repair department that is certified in warranty and non warranty repairs.
Q: What kind of tripod do I need for my laser?
A: Our lasers fit tripods with a 5/8 x 11 coarse thread. Dome or flat head tripods can be used. A flat head tripod will allow the user to check calibration easily out in the field. Q: Can the laser light hurt my eyes? A: The maximum power output for any construction laser is less than 5 milliwatts. A milliwatt is one thousandth of a watt. No special precautions need be taken with an invisible beam laser. Visible beam lasers should be set so they are not flashing in anyone's eyes because the light is very bright and can be annoying. Having the beam flash in one's eyes occasionally will not do any damage, but will be irritating in the same fashion as a camera flash.
Q: Can your construction lasers be used for turning angles?
A: Our visible beam L4.7 Magnum, L6 and L3 lasers have fixed plumb spots that provide a 90 degree reference laser beam relative to the rotating beam when the laser is in its vertical mode. This is only easily used indoors out of the sun.
Q: Can I use a laser receiver to pick up the plumb spot?
A: Electronic laser receivers are looking for a laser spot flashing across their photocells and will not respond to a stationary laser spot. That is why they can be set off by a flashing strobe or emergency beacon. Even if the receiver could pick up a stationary beam, the spot will be extremely difficult to find at any substantial distance from the laser.
Q: What happens if my construction laser is rained on?
A: Pro Shot lasers are water and dust resistant. Some dealers test our lasers by dumping a bucket of water over them. Simply dry the laser off before it is stored
Warranty Information: The Guardian 36 month warranty covers any defects in materials or workmanship and also covers the internal leveling mechanism, laser diode, optics and rotating mirror against damage from any cause.
