Ambient Weather TM-206 Solar Power Meter (Pyranometer)".But the seller want to change the title to "Tenmars TM-206 Solar Power Meter (Pyranometer) The Ambient Weather TM-206 solar power meter (pyranometer) is ideal for checking solar panel efficiency, car and home window treatments and other applications where solar energy is important Simply turn on, point at the light energy source and read the large display; Measurements in both W/m2 or BTU (ft2*h) Perfect for homeowners, technicians and engineers 1 year factory warranty