The Apex Instruments Standard Method 5 Heated Probe feature a 1″ diameter sheath constructed from corrosion resistant stainless steel, modular 3/8″ pitot tip, 1/4″ stainless steel quick connects, Type-K thermocouples for stack & probe temperature, probe heater and an orsat line, and a small parts package. Standard lengths are 3’ to 16’. Longer lengths and custom orders are available by request. Probes are ordered according to nominal (liner length). Effective length is one foot less than nominal length.