The world's most sensitive laser soup can BAROMETER!

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This gadget is currently one of the most responsive weather gauges on the planet... That's until YOU build another one! With a 540ml Campbell's soup can, a balloon, and a cheap laser pointer you can make a barometer that's so sensitive its indicator will sweep across a scale of well over a meter down a short hallway. In fact it's so responsive that even touching the can will cause it to swing the laser quickly upwards due to the heat from your hand! Aimed down a hallway you'll see the weather outside change the reading second by second. Aim it across a gym or warehouse for even more dramatic results and a faster longer beam path! Print the parts, assemble them as shown using wire for hinges and you too can watch the waves of the atmosphere thin and thicken above you. All readings are inverted of course since the balloon rises as air pressure drops. To turn on your laser press the button down and slide it under the ring so it stays on. If you have trouble inserting your laser into the ring remove the front cap on it temporarily. To run your laser for extended periods wire it directly to a suitable power source. To avoid heating the can lift it by the support or ring. A ridiculously responsive instrument made by your own hands to make you the envy of your tech-savvy friends. Sized specifically for a 540ml Campbell's soup can. (Calibration not included)