YES (Yankee Environmental Systems) was founded in the late 1980s by a team of scientists and engineers with expertise in theoretical physics, software, and precision analog electronics. The company specializes in developing advanced environmental sensing technologies to address global challenges such as ultraviolet radiation measurement, ozone depletion, and climate change. Their flagship products include the UVB-1 pyranometer and the Total Sky Imager, offering state-of-the-art solutions for automated weather observation and environmental monitoring. YES focuses on providing professional-grade optical water vapor instrumentation, radiometers, and shadowband spectroradiometers for accurate and reliable data collection in various applications. They collaborate with research universities and national laboratories to innovate and advance environmental sensing technology.