Description Literature Accessories Description Static Pressure Probes and Tubing Kit that contains two static pressure probes and two 4 ft. (1.2 m) lengths of tubing. This kit is an accessory for the TSI Alnor Airpro AP800 Micromanometer and the TSI Alnor AP500 AirPro Air Velocity Meter. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories TSI Alnor AirPro Velocity Meter AP500 In Stock