Conductometer:

From above discussion we could conclude in which conductance reciprocal of resistance and the resistance of a cell are could be measured through placing it in an arm of a Wheatstone bridge.  The inverse of the resistance gives the conductance and can be directly read on a conductivity measuring instrument, known as "Conductometer".

A classical conductometer, consists of an ac source, a Wheatstone bridge circuit, a null detector or direct reading show and a conductivity cell.

To prevent the effects of polarization, that is. the change is composition of the measuring cell, alternating current (ac) is used.  An instrument has an arrangement to convert the supply of 50 Hz to higher frequency that says 1000 Hz.  To measuring low conductance solutions, the lower frequency is preferable and for high conductive solutions higher frequencies are preferably used.

Many inexpensive conductometers are commercially available. The instruments come as a line-operated unit with and without digital readout. Figure provides the view of a typical conductometer, that could be operated as with given instructions.

Figure: Conductometer