Chatillon® FG/CO Conical Probes Cone probes may be specified by the angle of the probe required for penetration testing. Cone probes are often used for testing samples for their rupture characteristics such as pharmaceuticals, packaging, cosmetics, food products, sealants, mastics, creams and pastes. Cone probes are also used to measure the spreadability of dairy products such as butter, margarine and spreadables. These probes have an M6 male thread.