The letters in the highlighted squares are A, M, O, R, T, E, M, E and N. Rearranged, these spell MANOMETER.
A manometer sounds as though it might be an instrument to find the ‘measure of a man’, but in fact takes its name from Greek manos, meaning ‘rare’ or ‘thin’, and metron, meaning ‘measure’. It is any instrument that allows us to measure the pressure exerted by a fluid, and there are various designs.
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