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These window sights are used for fluid sighting on hydraulic tanks, pressure vessels, reservoirs, packaged power equipment, hydraulic lines and piping or most any application where oil or fluid inspection is essential. Two or more sights can indicate a high level, a low level, and if desired, levels in between. These sights are principally used to visually indicate liquid levels, observing liquid condition, fluid motion, mechanical movements, or tests performed with a safe enclosure.