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Instructions  :  Chassis Setup Tools


Laser String Gauge

Laser String


Part Number 3208983 (Discontinued)


Laser String Gauge:  You have selected the most advanced, state of the art portable laser alignment system.  The laser supply or module is a 5-milli watt solid-state laser.  It incorporates a laser diode and 4 optical lenses for laser focus and line generation.  The Laser String is battery powered and uses a 3-volt camera battery found in most stores that supply a good selection of batteries.  The Laser String is positioned vertically to create a vertical reference plane parallel to the tire surface.  The Laser String allows a single operator the ability to perform a rear axle alignment using a procedure similar to commonly used methods.  Advantages of laser string include:

  • Eliminates the need for a second operator commonly used in string methods.
  • Eliminates the use of judgment as to whether or not the string is accurately aligned or parallel to the outer surface of the tire.
  • Eliminates the need to realign the string after an adjustment to the rear axle.
  • Repeatable.
  • Increased speed in performing an alignment.


The Laser String is bi-directional, meaning it can be used to shoot the laser to the front or the rear of the vehicle and on either side of the vehicle.  There are additional uses for the Laser String by removing the laser head.  Examples of possible uses:

  • Create a horizontal plane above race scales or setup pad to set them on the same plane.
  • Aim the laser at body panels to create a reference line for applying lettering.
  • Aim the laser at the chassis centerline above the roll cage for setting body panels.
  • Create a reference plane on the chassis centerline under the vehicle.
  • Aim the laser to the rear of the vehicle to check alignment of rear clip on a stock car.
  • Check rear wheel offset to vehicle centerline or frame rail, etc.


The battery is installed as shown in Figure (A).  The positive (+) end of the battery must face the switch end cap.

Note:  The battery is a 3-volt, Duracell DL123A or equivalent.  Using a lithium battery will provide optimum operation.  Turning the laser off when not in use will extend battery life as well.

 Caution:  Use of controls or adjustments, or performing procedures other than those specified herein may result in harmful radiation exposure. 

Federal Regulations:  Complies with 21 CFR parts 1040.10 and 1040.11


Instructions for use 

The following procedure is best performed on a flat and level surface. 

1.      Place the Laser String on the ground with the alignment bar approximately to 1 from the edge of the tire and release the handle.  The Laser String straight edge should now be against the surface of the tire.

2.      Using the level vial, level the Laser String tripod with the front adjustable leg.  NOTE:  The laser tripod will be at a 7-degree angle with the level vial at level.  This is normal.

3.      Check to see if the limit pins are touching the edge of the two-inch holes.  If touching, repeat steps 1 and 2 until limit pins clear edges.

Caution: The laser being used is a low power laser with a light output of only a few milli-watts.  It should not be confused with powerful lasers intended for burning, cutting, and drilling.  Although the beam is low power it should be handled with caution and common sense.  The greatest potential for harm from lasers is to the eyes.  Just as one should not look directly into the sun or high intensity lamps, avoid looking directly at the laser beam or staring at the reflections from the laser mirror used in the system.  Advise other personnel in the immediate area of the use of lasers.  Keep this product out of the reach of children.

 4.      Turn on the laser by pressing the red push button on the switch cap.  Some models may have a rotating black rubber knob.

5.      Take two measurements at arrows shown in illustration as you would in a typical string setup.  Adjust rear axle until measurements are equal.

6.      Place Laser String on opposite side of vehicle.  Take two measurements at arrows shown in illustration as you would in a typical string setup.  Measurements should be equal with those taken in the previous step.  If they are unequal and the vehicle has a solid rear axle there is a toe condition.  For independent rear, adjust for equal measurements. 

7.      Once measurements are equal (zero rear offset) use the Laser String to set toe angle and measure camber angle using the common string method by measuring from the laser to your front wheel.  Additionally, by using the red laser marking on the ground, it is possible to determine the contact patch alignment front to rear.


NOTE:  When using laser head for fixturing, alternate methods of using the level vial for setting laser perpendicularly to your work piece are recommended for higher accuracy.  Fro applications of distance greater than 14 feet it is recommended that the two foot alignment bar be calibrated to specific tolerances.  The factory calibration of the laser to alignment bar is set for parallelism of .032 @ 14 feet.

 Rebco Performance Products no longer sells this product.


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