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Abstract Low-pressure laser-induced breakdown spectroscopy (LP-LIBS) offers improved spectral resolution relative to atmospheric pressure operation due to reduced line broadening and may also improve the signal-to-noise ratio. However, implementing LP-LIBS for in-situ material characterization presents significant technical challenges, particularly in maintaining stable low-pressure conditions during measurements. The aim of this work is to, for the first time, present design, construction, and validation of a modular LIBS measuring head specifically engineered for in situ operation at reduced pressures (1-200 mbar) with adaptable sealing configurations. The system features three distinct vacuum sealing approaches, interchangeable adapters for various surface geometries, and the capability for integration with advanced plasma excitation techniques including high-voltage discharge enhancement. Experimental validation using multiple elastomer materials demonstrates effective sealing across diverse surface conditions, achieving pressures below 1 mbar on smooth surfaces and maintaining stable conditions at 10-20 mbar up to atmospheric pressure during spectroscopic measurements. Spectroscopic characterization confirms the absence of atmospheric contamination and demonstrates analytical performance comparable to conventional vacuum chamber LIBS setups. The modular design enables customization for specific analytical requirements, including spatial confinement, magnetic field application, and discharge-enhanced excitation schemes. Spectroscopic testing also revailed that the achieved SNR in the measuring head with CCD camera is around 3000, while realized discharge-enhanced excitation scheme caused eightfold increase in Cu I line intensities. This versatile measuring head addresses critical technical barriers in LP-LIBS implementation and extends the technique's applicability to challenging in-situ analysis scenarios across materials science, industrial diagnostics, and specialized applications requiring controlled low-pressure environments incuding diagnostics of plasma facing components of fusion related reactors.