500
Describe, in detail, how to find the mass of a rock using a triple beam balance and tell the unit used to label the mass.
1- Zero out the balance
2- Place the rock on the pan
3- Move the riders one at a time, starting with the largest (100's, then 10's, then tenths). Move each a notch until it falls, then move it back one.
4- Add up the final numbers shown on the beams
5- Label it with grams