Apparatus and instruments for physics, namely microscopes, proprietary constant composition expansion analysis chips for reservoir fluids, swelling factor characterization chips, minimum miscibility pressure chips, diffusion coefficient measurement chips, hydraulic fracturing fluid optimization chips, T-sensor chips, micromodels (porous media) chips, densitometers not for medical use, rheometers for measuring the viscosity and viscoelasticity of fluids, pressure sensors, infusion and injectio...