You can buy a cat.
You can't use electronics because it can shock you are ruin that electronic. Also if you don't want to get something wet like your shoes then you can't use the water displacement method.
Displacement method.... Is the method to find volume of an irregular object
"displacement volume"
Water displacement is a method to measure volume
the water displacement method
The displacement method is used to determine volume. However, if you know the density, the displacement test can give volume, which is used to work out mass by the formula m = dV
The water displacement method is typically used to find the volume of an irregular solid. The object is submerged in a known amount of water, and the increase in water volume is measured. This increase in volume is equal to the volume of the irregular solid.
volume
using water displacement method
By carrying out the water displacement method
volume
Use the water displacement method