The 336C-SD multi-purpose probe is perfect for electronics and bio-chemistry, lead-free soldering operations, dosing chemicals in lobs, removing solder masking agents, rubber latex and adhesive coatings. Probes are made from PEEK, a high temperature thermoplastic which is inert to all common solvents. It resists a wide range of inorganic liquids. Peek has a working temperature of 249 deg. C (480 deg. F) and is electrically conductive. thermoplastic which is inert to all common solvents, it resists a wide range of inorganic liquids. It has a working temperature of 249°C (480°F) and is electrically conductive. Square body with one curved fine tip and one flat strong point.