Laser distance sensors use a laser diode to accurately measure the distance from the sensor to an object. The use of a laser diode is required since it emits only a discreet and specific wavelength constantly, though consistency of the wavelength depends on the voltage and current the diode receives. If these parameters are changed the wavelength changes as well, even if it’s less than a few nanometers. If the wavelength varies it slightly impacts the behavior of all the optics and lenses in the sensor and might cause a little decrease in the sensor’s performance resulting in a decrease in accuracy. That is why the guidance is to wait ~40 min after the sensor is powered on until it reaches temperature stability and the internal temperature is the same as when calibrated.