1. The metric system of weights and measures shall be introduced in this contract unless otherwise instructed by the Purchaser.

2. Attached to the user's arm, they employ a system of weights and magnets which provide an electric current to top up charge in a storage battery.

3. Standardizing the system of weights and measures is one of most important measures as for the first emperor Qins stabilizing its country.

4. Attached to the user's arm, the kinetic energy charger is the size of a pack of cards and employs a system of weights and magnets which provide an electric current to charge up a battery.

5. Even if we could construct indexes of output, real costs, needs, state of the environment, we could not compute a welfare index because we have no system of weights to combine them.