Gallery Trex 800 e Trex 800 e Our aircraft with Prof Mark Zondlo’s VSCEL sensor. Girls Physics Camp 2012 Portable Gas Sensors Improve Atmospheric Pollution Measurements SmallPlane AMR Payload Master 100 First Flight with Mark Zondlo’s Laser Based Gas Sensors for H2O, CO2, and CH4 TREX 750e 450E Building Helicopters