An inexpensive single pan 135 mm diameter x 50 mm deep (detachable)
balance having a three point base and a levelling screw. The balance
has dual scales of 0-250g with 1g division and 0-1kg with 10g division.
The changeover of the scale range is done by lowering or raising the 
mass on the Pointer Arm. A hook provided under the pan is used for 
density experiments.