Half a croissant, on a plate, with a sign in front of it saying '50c'
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Space Scale

 How much do you weight in space?
 
(+1, -1) 		  [vote for,
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This is a normal digital scale for the bathroom.

Step on it and it tells you how much you weigh on the moon, mars, pluto, the sun, or on the ISS. Pick a couple of your favorite weights to show at any time.

This is so you can start your diet weighing yourself on the earth but later switch to pluto if you haven't been having any luck.

—mylodon, Nov 05 2017

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       This is a tricky one, because the scale should read in kilograms, which is a unit of mass, not weight; and mass is constant irrespective of local gravity.   

       Bathroom scales actually measure force, in Newtons, and convert that using an assumed general value of g to kilos.   

       On a body with a different value of g, the downforce changes, but the mass (and inertia) are constant.
—8th of 7, Nov 05 2017
   

       Nice. You have to give it a direction and a position in the universe, the scale gives an astronomically accurate, weight.
—wjt, Nov 06 2017
   

       Now that we have more than one bathroom, I wait considerably less.   

       Add measurements at the equator, the poles, on top of Mt. Everest, and the earth's outer core for the fun of it.
—RayfordSteele, Nov 06 2017
   


 

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