The Conductivity Probe (CON-BTA), as well as the Go Direct^® Conductivity Probe (GDX-CON), electrode body is made of ABS plastic with a graphite electrode while the Platinum-Cell Conductivity Probe (CONPT-BTA), electrode body is made of epoxy with a glass electrode. It is best to determine the compatibility of your reagent with the probe based on your exact reagent using a chemical compatibility chart. Cole Parmer has a nice one: https://www.coleparmer.com/Chemical-Resistance