A modular optical sensing platform easily integrates multi-point spectral sampling and reference monitoring into process streams and other sample environments. Jaz is a family of stackable, modular and autonomous components that share common electronics and communications. At its heart is a miniature CCD-array spectrometer, available with user-selected grating and slit options optimized for a variety of application needs, in a design that accommodates up to eight spectrometer channels. Each Jaz stack includes a powerful microprocessor and display, so that full spectral data can be acquired, processed and stored onboard the unit – without the need for a PC. Spectral data also can be transferred to a laptop or desktop PC for additional post-acquisition processing, such as displaying x-axis values in wav-enumbers or nanometers or combining data from multiple spectrometer channels in a single graph.