Description Accessories Description The Probe Protective Case is an accessory for TSI AirPro® measurement and extension probes. Please note: a protective probe case is included with the purchase of AirPro probes models VTH-A, VTH-S, VT-A, VT-S, TH-S and the AirPro AP500 Probe Extension. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories TSI Alnor AirPro Velocity Meter AP500 In Stock