The Perfect Alignment Laser, or PAL2easily attaches to your work surface. PAL2 makes it so easy to hoop square. Just raise or lower the laser to align the outer hoop's horizontal and vertical center markings with the illuminated crosshair. After sliding the fabric under the beam and inserting the inner hoop into the outer hoop, you know the fabric is square in the hoop! Plus, PAL2 works with any hoop!