eatures: Real time recorder, save the data into the SD memory card and can be downloaded to the Excel, extra software is no need Wide spectral range, long term stability, cosine correction Range: 2000 W/m2, 634 Btu/ (ft2 x h) Spectral response: 400 to 1100 nm 3 Function: Solar Power, Power Integration, Transmission Cosine corrected Both meter and sensor probe are built-in the tripod fix nut, easy installation Separate probe, easy for operation of different measurement environments Data hold, Record (Max, Min) SD card capacity: 1 GB to 16 GB, SD card is not included RS-232/USB computer interface Application: solar radiation measurement, solar power research, physics and optical laboratories solar transmission measurement