Leveling Laser Level
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What level optical density laser safety glasses should I wear when playing around with my 150mW laser pointer?
It is a green 532nm laser with a divergence of 1.2mRad
Your laser safety glasses should have an optical density or OD of between 3 and 4. If the optical density is more than four, visibility will be too low and you’ll have trouble pointing or aiming your laser pointer. If optical density is lower, the laser safety glasses will not provide enough protection at higher power levels.
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