What i use for low power lasers is a meter branded by sper scientific, pocket laser power meter 840011. the down side is it is not liner but on the inside door is a curve with a correction. I don't know know if others use them as they can not handle above 40mw, they are about 200 bucks on fleabay Thermophile laser meters i don't trust at low power levels but i could be wrong
There are a number of companies that sell safety glasses for that wavelength. I don't think specular reflection is a hazard at 3mw, but from a reflective surface i would not be comfortable with. When in doubt always wear glasses.
my biggest fear with IR is you can be dead on to the aperture and not know it
Remember Remember The 8th of November, When No One Stood, but Kneel, In Surrender
In a popular government when the laws have ceased to be executed, as this can come only from the corruption of the republic, the state is already lost. Montesquieu