Dwyer 160F-24 Straight Stainless Steel Pitot Tube 24 Inches Long is made out of tough and durable stainless steel and is etched with insertion depth graduations and a flow alignment indicator in order to help keep the pitot tube parallel with the air flow. The Dwyer 160F-24 has a straight design so it is easy to insert into ducts through grills and pressure taps.