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Testing the conductivity of solutions gives important insight into the nature of the solutions and the particles in the solution. Traditionally, devices used to test the conductivity of a solution or solid usually consist of expensive devices such as volt-ohm meters or specific conductivity meters. Less expensive devices using one or several 120-volt lightbulbs can be constructed that use the brightness of the bulb(s) to indicate the conductivity. These latter devices present a danger in that they usually utilize exposed electrodes presenting a possibility of electric shock or electrocution at 110 volts and up to 15 amps current. Although commercial versions use shielded electrodes, the high voltage and current remain.