If you think that your laser's calibration is off, you can quickly check it yourself. Set up your instrument and its tripod around 160 feet away from a wall, and use a pencil to mark the laser's position on the wall. Then, turn the instrument around and use the other side to mark a point on the wall. If these points are within five millimeters of each other, your laser is properly calibrated.
Unlike many levels, you can calibrate your Topcon instrument by yourself. Perform a similar series of checks as you would to verify the calibration, and then use the slope adjustment function to return the different sides to proper alignment. Pressing the button that turns off your height alert makes your instrument remember its new settings.