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The reason that the green beam is easier to see is that your eye is 10 or more times more sensitive to green than to red. If you bought your laser from a site that gave a milliwatt rating of 5mW or less, then you don't need to worry about brief reflections. Even with very low milliwatts you...

I have just ordered a fancy ALL-LCD multimeter. It looks like a modern smart phone. I am beginning to think that I might have made a mistake. I live in Illinois, where typical over-winter lows formerly were always -20 degrees Fahrenheit or colder. There were days that the daytime high was...