Compact spectroradiometer with imaging grating designed for the visible range, offering a variety of applications. The device measures spectral luminance, chromaticity coordinates ((x,y), (u',v')), correlated color temperature, color purity, color rendering index, RGB, circadian metrics and photosynthetically active radiation, with a 4.5nm optical resolution (FWHM) and USB 2.0 fullspeed and Bluetooth interfaces, as well as an integrated display allowing quick reading of all available measurements.