Vernier® Conductivity Probe

This probe has applications in both biology and chemistry classrooms.

Biology teachers can use this probe to demonstrate diffusion of ions through membranes or to monitor changes in ion levels in aquatic systems. Chemistry students can use it to investigate the difference between ionic and molecular compounds, strong and weak acids, or ionic compounds that yield different ratios of ions. The conductivity probe can also monitor concentration or conductivity at three different sensitivity settings. Probe takes readings in units of conductivity (μS/cm) or concentration (mg/L TDS as NaCl). Alternating current is used at its electrodes to prevent polarization and electrolysis, so that solutions being tested are not fouled. Corrosion of metal electrodes is not a problem with this epoxy-body graphite electrode.

It has built-in temperature compensation, which allows you to do your calibrations in the lab, and then make measurements outdoors without temperature changes affecting conductivity readings. The probe also has a fast response time, reaching 98% of full value in less than five seconds. You can load saved calibrations using any of the Vernier data-collection programs. You can also do a quick two-point calibration: the probe is left out of solution for one calibration point (0 μS/cm) and is placed in a known standard (1000 μS/cm solution is provided) for a second calibration point.

Operating temperature range: 0 to 80 °C
Cell constant: 1 cm⁻¹