The current Balance is a device that attaches to an AIR CORED SOLENOID and is used to measure the reaction of a conductor carrying current inside a magnetic field. 

As the balance deflects due to the force of the conductor moving inside the field,  very small weights are placed on the front end of the beam to restore the beam to being horizontal again.   The amount of weight to achieve this is equal to the force displacing the beam.

The weights are small coils of thin stainless wire.  4 different weights are provided:  10mg, 20mg, 40mg and 60mg.   Use combinations of these weights to determine the restoring force required.
This small set of mini weights is supplied with a pair of tweezers with which to handle the weights.

 Instruction Sheet