Set of Standard Masses

A wooden box with a set of 13 standard masses and one pair of tweezers.

Figure 1: Set of Standard Masses. Top corner view.

A wooden box with a set of 13 standard masses and one pair of tweezers.

Figure 2: Set of Standard Masses. Front center view.

This is a set of standard masses, used for calibration, lab demonstrations, etc. In addition to the usual high-mass masses, this set includes some as light as 0.0001 g, even including a set of tweezers for handling them.  Their manufacturer and age is unknown, as neither the case nor the masses bear any discernible markings, except for the word "Germany" stamped onto the bottom of the 200 g masses.