300mW Laser Tape Level Measurement
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First, the laser power already is low. You have a Class IIIa (also called 3R) laser which has a maximum output of 5 milliwatts. This is considered safe for momentary (less than 0.25 seconds) unintentional viewing of the direct beam going into your eyes. As long as you do not override your blink reflex or aversion response, and look directly into the laser beam for many seconds, you will be fine.
Second, the laser’s already low power is being spread out in two ways: 1) By being made into a line instead of a dot and 2) By hitting the paper and thus diffusing in many directions. Note that you can see the laser line from many different angles and positions. This indicates the beam power is spreading throughout the room. Your pupil is intercepting just a small part of all that diffused light.