EquipmentDensity measurement requires:
- a precision scale (0.01 g)
- a glass filled with water
- a paper clip
- a piece of string, 10 to 20 cm long
- Weight the coin and write down its weight .
- Tie the string to the paper clip.
- Put the glass of water on the scale.
- Put the clip fully under water while suspended to the string. Make sure the clip makes no direct contact with the glass.
- Set the scale tare (set it to 0).
- Put the coin in the clip. If the coin is too large, bend the clip and set the coin on top of it.
- Put the coin and clip fully under water. Make sure they make no direct contact with the glass.
- Write down the new weight displayed on the scale .
ResultsYou'll find the density by dividing the coin's weight  by the additional weight when the coin is in the water .
This density way may not be accurate. You should not fully trust its result and only rely on it.
It addition, you might want to test the coin with a magnet. If the coin moves toward the magnet it has to be nickel, iron or steel. If not, it is another metal or alloy.