The Siena spectrometer takes near-infrared spectroscopy to a new level. It combines the performance and flexibility of an array-based spectrometer with the size, price and reliability required for mobile applications and industrial sensors. For the first time it offers wavelength ranges up to 2100 nm with an uncooled InGaAs array sensor. The Siena delivers the technical performance for precise measurements at a price suitable for integration in portable and industrial sensors. Large absorbance values can be accurately measured due to its superior sensitivity, optimised stray light suppression and high dynamic range.