Conductivity tester is an instrument used to measure the electrical conductivity of a solution, which indicates its ability to conduct electric current. This property is directly related to the concentration of ions present in the solution. The device typically consists of a probe with electrodes and a meter that displays the conductivity reading. Conductivity testers are widely used in water quality analysis, environmental monitoring, industrial processes, and laboratory research to assess the purity of water, monitor chemical concentrations, or ensure process control. They are essential for applications such as checking drinking water, wastewater treatment, and aquaculture. Portable and benchtop models are available, offering accuracy, ease of use, and often temperature compensation for reliable measurements. Conductivity testers are vital tools for maintaining quality and safety in various fields.