HOW TO USE A LASER LEVEL
Set up the laser on a tripod or flat surface. If it’s a manual level, you will have to make sure the bubble vials show level. Turn on the laser level. And if it’s self-leveling, give it a moment to level itself. The unit will emit a laser that shows level on a wall or across an outdoor workspace. Depending on the type of laser level, it can be dot, multiple-line, or rotary (which shows level at 360 degrees horizontally or vertically). You can use a laser detector to intercept the laser if there’s no wall to “catch” it (which is typically needed outdoors). Attach the detector to a measuring rod. Then, move it up and down until you hear beeping (which means that it has found level). Secure the detector to the rod, and make your measurements as necessary.
CALIBRATING A LASER LEVEL
Set up the laser on a tripod 100 feet from a wall, and rotate the laser with the front pointing to a wall. Turn on the detector and laser level. When the detector gives you a signal indicating level, make a mark on the wall. Rotate the laser level 180 degrees, and make a level mark with the detector again. Measure the difference between the marks. And if it’s within the devices specified accuracy, it’s correct. Rotate the laser 90 degrees, and make another mark using the detector. Measure the difference between this mark and the previous one. If it’s within the device’s specified accuracy, it’s correct. If it’s out of range, it will need to be professionally calibrated.