Many weather intstruments are not difficult to make, and a humidity gauge is no exception. Used to measure the amount of moisture in the air, a quick and easy gauge begins quite literally with the hairs on your head. Using human hair and commonly found items around the house, a homemade humidity gauge can be made in less than an hour.
The first step in making a humidity gauge is to gather your materials. You will need three eight-inch human hairs which you can pluck from your head or a willing friend. A 9 x 4 inch piece of styrofoam or wood is also needed is needed for a base as is a three-inch square cut out from a plastic milk jug to act as a pointer. One dime will also be placed at the end of the pointer.
After gathering your materials, the next step is the actual assemblage of your humidity gauge. First, cut your three-inch square of plastic into a triangle shape which will serve as a pointer. Glue the dime on the wide end of your new pointer. Next, glue one end of each of the three hairs onto the middle of the pointer. Then attach the pointer to the base with a thumbtack. Make sure you place it low on the base. Move the pointer back and forth; rotating it on the thumbtack until it can moove loosely and freely. Finally, hold the base parallel to the ground and glue the other ends of the hairs down so they are taunt.
After sucessfully making a humidity gauge, it's now time to text it out. When the air is humid, the hairs will get longer and the pointer will point toward the ground. Dry air will cause the hairs to shorten and the pointer to point upward. A good way to test your new instrument is to take it into the bathroom after a steamy shower. The humidity level will be at 100%, so you can easily tell if your new humidity gauge is working properly.