We often encounter that customers have experience with cheaper leveling lasers that can make a line or a cross. On these devices it says 1mW power, safety class 2 and it shines beautifully.
We have measured with instruments at several facilities that this is a misleading half-truth.

The power of a normal cross optic level is 10mW and that is for each line separately..(class 2M)
On the device it says 1mW power which is the conversion of power per 1mm2 right at the output of the device...
(if the line is 10mm and 1mm thick it is 1mW per mm2 with a 10mW diode... For a 90° beam angle, such a line is already 5mm from the center of the cylindrical optic that generates the line... and because it is all encapsulated in the device, certainly at a depth of 5mm, the manufacturer writes 1mW (at the output) and laser class 2...
It's a circumvention of EN 60825-1. But because common levelers are made in China and few people understand this problem (certainly not customs) so nobody solves it... The correct marking of such products should be Class 2M and devices with nominal power of 10mW.

This is all done so that the general public is not scared and the hazard class label has the lowest risk value.
It makes the product easier to sell... Of course, the average customer will not study the standard, if he already does something he will look at the laser class table. Which can sometimes scare them 8-)