How Laser Levels Work
Here ’s the office : You ’re stand on your couch with ahammerand nail in one hand and alevelin the other . You ’re trying to hang a series of framed pictures , but you need them hung in a straight line – after all , this is n’t aLeaning Tower of Pisasort of above - the - lounge gallery . Problem is , it ’s physically inconceivable for you to confine the stratum against the paries while you also hammer in a bunch of nail ....