The hand-held four-band active sensor system shown in Fig. 1 was used for data collection. The system consisted of four narrow-band (active optic) light sources and reflectance sensing elements of different wavelengths: two in the visible region (at 570 and 670 nm), one in red-edge region (750 nm) and one in the near infrared region (870 nm). The spectral band width for four bands was about 50 nm. The accuracy of the reflectance is 1%. Each spectral region represents unique properties that can be utilized for palm oil FFB maturity classification. The bands 570 and 670 nm represent green and red spectral regions of the electromagnetic spectra. These bands were chosen as green and red bands could be strongly related to unripe and ripe/overripe fruits, respectively.