There are multiple devices that can be used in the laboratory and during field work. In this podcasts you see just three devices that can be used for different purposes like the SPAD meter for the determination of the chlorophyll content in plant leaves, the photometer for the determination of the surface color of plant, soil and rock samples and finally the portable XRF instrument for the quantitative determination of the bulk elemental composition of solid and liquid samples, especially for heavier elements.