BTD-300 Achieves Longest Continuous Record of 100 Hz Atmospheric Electrostatic Measurements in the World! This week marks 10 years since we installed the BTD-300 Thunderstorm Detector on to Biral's Managing Director's roof,… The effects of Surface Reflections and extraneous light on Forward Scatter Visibility Sensors Forward scatter visibility sensors operate by detecting the light scattered from atmospheric particles which pass through the measurement…