Is there any significant difference between a glass body electrode and a plastic or epoxy body electrode?
A. Basically no. They both use a glass membrane and ceramic junction to perform the measurement and either should give similar accuracy. Plastic electrodes normally work up to temperatures of around 80°C whereas glass can get to 100°C or higher. The choice is usually one of cost and/or ruggedness for the type of use. An epoxy body laboratory style electrode would probably be the better choice for field use because it is harder to break. Glass is often preferred in the laboratory because it is easier to clean. Some chemicals can soften or melt epoxy plastics which can limit their use. Epoxy plastic electrodes are usually the least expensive choice and are ideal for household type measurements like fish tanks, ponds & swimming pools.
