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Internet # 313698955

Model # 3521-21

Store SKU # 1005499558

100 ft. REDLITHIUM Lithium-Ion USB Green Rechargeable Cross Line Laser Level with Charger

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  • 8+ hour runtime - removable rechargeable battery
  • High intensity green cross line laser level
  • Fast alignment micro control
  • View More Details
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Product Details

About This Product

The Milwaukee USB Rechargeable Green Cross Line Laser is powered by REDLITHIUM USB, delivering all day runtime and uncompromised visibility. The high-intensity laser beams allow users to see the green lines up to 100 ft. for fast and accurate leveling and alignment. The integrated magnetic bracket features micro control, providing users with a faster set-up and point to point alignment at long distances. The Green Cross Line Laser Level offers amplified rare earth magnets that provide a strong hold onto metal surfaces while the integrated screw and nail hang holes make setup easy and efficient in any environment. Users can charge the REDLITHIUM USB Battery inside the laser via Micro USB or swap it out with additional REDLITHIUM USB Batteries for virtually no downtime. The Milwaukee USB Rechargeable Green Cross Line Laser is covered by a 2-year warranty.


Product Information

Internet # 313698955

Model # 3521-21

Store SKU # 1005499558

Additional Resources

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From the Manufacturer


Dimensions: H 5 in, W 3.5 in, D 6 in


Product Depth (in.)

6 in

Product Height (in.)

5 in

Product Width (in.)

3.5 in


Battery Type Required


Compatible Battery Type





Adjustable, Magnetic

Hand Tool Type

Laser Level


Battery(s),USB Cable



Laser Color


Laser Level Mounting Method

Tripod, Wall

Max Laser Distance (ft.)

100 ft.

Measurement Accuracy (in.)

±1/8 in.

Number of Batteries Required


Number of beams


Number of Measurements




Tools Product Type

Hand Tool

Warranty / Certifications

Manufacturer Warranty

2 Year Tool and 2 Year Battery

Questions & Answers

Q:what modes does this laser offer
by|Oct 26, 2023
1 Answer
Answer This Question

A:  The following modes are: •Horizontal Level Line & Horizontal Points •Vertical Plumb Line & Plumb Points •Perpendicular Level, Plumb Points and Horizontal Points

by|Oct 31, 2023
    Q:Is this level safe to work with other people in the room or should the room be vacated while level is turned on?
    by|Jul 30, 2023
    1 Answer
    Answer This Question

    A:  Yes, it is safe to be turned on while people are in the room. - Milwaukee Tool, Social Team

    by|Aug 1, 2023
      Q:Does the laser come in a hard case
      by|Apr 9, 2023
      1 Answer
      Answer This Question

      A:  Hello Trav- It comes with one carrying case. - Social Team

      by|Apr 10, 2023
        Q:Can it Milwaukee laser level hold on a corner Bead like the DeWalt can?
        by|Feb 15, 2023
        0 Answer
        Answer This Question
        Showing 1-4 of 19

        Customer Reviews

        4.2 out of 5

        • 4.2 out of 114 reviews
        • 59% recommend this product
        Filter by:
        Showing 1-10 of 114 reviews
        Multi laser
        This is a really neat tool, I really love this one. It has soo many features but at the same time it’s very easy to use. It has magnets on the back of the base if you can mount it on a metal base, or it can be mounted on a tripod, or you can just set it on a horizontal surface. The laser settings allow you to use a horizontal plane, vertical plane, plumb line, or all lasers at once. As far as the base you can move the whole laser side to side and then use a knob for fine tuning. You can set the laser to self level or lock it to get different angles. It also comes with a case that can keep it safe and contain other accessories related to this tool including batteries, and charger.
        • Recommended
        Milwaukee Laser Level
        Milwaukee Laser Level is a very handy tool. I have used it for hanging picyures, putting up suspended ceilings and many other leveling jobs. It takes the guess work out of the way. I have set mine up on a heavy camera tri-pod with great success. It works well in all building projects around the house. I have helped neibors with their leveling projects. The level came as a tool only but I had batteries and chargers that fit in the case.
        • Recommended
        Can use any M12 battery
        This is the bare tool only in a large blow molded case – the case has compartments for an extra battery, battery charger and all accessories made for the tool. The green laser is extremely bright when used indoors – it can be used outdoors but a laser line detector will be needed. The four points, top, bottom, left and right are bright and distinct from the level and plumb lines, but appear only when the level and/or the plumb lines are selected - you cannot select just the points. This is easy to use, there is a power switch on the side, a mode switch on the top and a micro control knob below the power switch. The battery power level lights are located near the mode switch, additionally there is a power save indicator light next to the battery level lights – this light will pulse when the battery is low. The power switch allows selecting either self-leveling or locked beams – if locked is selected, the beam will flash every 8 seconds to warn that it is not leveled. The self-leveling can correct up to 4 degrees. There are 4 rubber pads / feet on the back / bottom mounting surfaces, additionally there are 4 tenacious magnets on the back hanging panel. There are also 1/4" and 5/8” tripod mounts on the bottom, The Operator’s Manual is very detailed and also includes Accuracy Field Check procedures.
        • Recommended
        Nine hour runtime on a 3 Ah battery
        The Milwaukee 3624-20 M12 Green Cross Line and 4 Points Laser has a very bright green laser that can be seen from 125 feet. The range is extended to 165 feet when used with a detector. It features three laser modes: 1) Horizontal only; 2) Vertical only; 3) Horizontal and Vertical. It also includes a knob that can pivot the laser on point for micro adjustments as well as very strong magnets for attaching to metal studs. This specific product includes the laser and a case only. You need to purchase a battery charger, detector, tripod, etc. separately. The case is blow mold style and has a Styrofoam insert to protect the equipment. The insert also has cutouts for a charger, battery and targets should you choose to buy them. The four points are configured as top, bottom and two sides. The point lasers only show with the lines. There is no option for them to be displayed without the lines. The vertical lines extend 165 degrees and the horizontal lines extend 210 degrees. The laser has a locked mode and a self leveling mode. In self leveling, the unit can compensate for up to 4 degrees of tilt. When the range is exceeded the laser blinks to indicate there is an issue with self leveling. While this product is primarily intended for indoor use, I did try it outside and the range was only a few feet before the laser could no longer be seen. Indoors it was easily visible on drywall.
        • Recommended
        horizontal, vertical, and plumb settings - just what I needed!
        Note that this is for the Tool Only. It comes in a case, but the laser level is the only thing in the case. That aside, this is a GREAT laser level. It gives you the horizontal, vertical and plumb settings (or all at once), and the laser is self-leveling, as long as you have it on a reasonably level surface. This in itself is fantastic, because it means a more accurate line. I use it to set my kitchen cabinets. I ran the level to get the top of the base cabinets, then measured up 18" for the wall cabinets. It has a strong magnet and I was able to stick it to a metal door. I had to really pull to get it off, so it's not like some of the laser levels out there that have weak magnets. The plumb spot is nice, because if you want to say center an island under a light, it will give you the precise center spot to put it. Although I haven't installed the panel next to the refrigerator yet, you can see from the photo that it will be easy to line it up. I'm waiting till we get the refrigerator in, so we have more room to maneuver it into place. So remember, this is the tool only and doesn't come with some of the other goodies like the battery, charger, target, and track clip, but once you add those you'll have a nice secure case to put them in.
        • Recommended
        Doesn’t last
        Had it for 3 months and maybe used it 4 times. never been dropped but will not self level or plumb now
        Response from Customer ServiceJan 20, 2022
        Hi! Thank you for telling us about your experience with the USB Rechargeable Green Cross Line Laser. We are sorry to hear that you are frustrated with this product. We will send you a follow-up email with additional questions, so we can gain more information. -Cayla with Milwaukee Tool
          Curved Laser
          Not even a month with this laser and already messed up, big curve on what is supooused to be a straight line, really dissapointed
          Response from Customer ServiceOct 12, 2021
          Hello! We are sorry to hear that you have not had the best experience with the USB Rechargeable Green Cross Line Laser. We will email you shortly to assist. -Cayla with Milwaukee Tool
            Another great tool from Milwaukee!
            I use the Milwaukee laser to get precision on my high hat layouts. Also very useful installing my cabinets! Quality at its finest!
              Very good all milwaukee products this product don't have a carry case it was send in a cardboard box not a good idea
              Response from Digital CareFeb 24, 2021
              Thank you for your review. Curios. We appreciate your honest feedback and we will pass it along to our team. -Jacob
                • Recommended
                Doesn’t last
                We had this product for 3 months and it broke already. It says the battery is fully charged but it keeps turning off.
                Response from Milwaukee ToolMay 8, 2024
                Hi Laura, thank you for taking the time to leave a review on your Laser Level and we are sorry to hear about your experience. Can you please send our team a message at social.media@milwaukeetool.com, so we can look into this? Thank you - Milwaukee Tool Social Team
                  • Recommended
                  Showing 1-10 of 114 reviews