Abstract: A particulate sampling probe comprising an L-shaped protective tube of cilar cross-section, and an intermediate tube and an inner collecting tube both of circular cross-section and concentrically disposed therein. The protective tube has an opening in one end permitting the entry of particulates into the collecting tube which communicates with the opening. A suction pump pulls particulates into the collecting tube. Exhaust from the collecting tube passes through a particulate collector, the pump, and a gas meter. Cooling air is introduced into the space between the protective tube and the intermediate tube near the collector, and exits from the protective tube from orifices near the opening in the protective tube. After a test, the preweighed collecting tube is removed from the protective tube and weighed. The difference between the pretest and post-test weights of the collecting tube and collector is a measure of the amount of particulates that has been sampled.