The CM-100 Conductivity Probe is intended for water quality testing, general chemistry and ecology experiments. It has two switch selectable ranges of 0-200 and 0-20,000 microsiemens. Its DIN 8 connector makes it suitable for connection to iWorx computer interfaces and amplifiers.

The CM-100 is included in the GBH-TA General Biology Add-On Set for the HK-TA Human Physiology Kit and the GBA-TA Add-On Set for the AHK-TA Combination Animal/Human Physiology Teaching Kit.