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Varies with altitude and temperature, but no significant variation with spatial position with regard to nearby fixed bulky objects. Often measured indoors, onlydo considerationnot willmount above any heating or cooling system as there temperature may be tryingparticularly variable, and try to avoid any forced ventilation or extraction as such air moving systems could have different pressures on intake and outlet sides. Equally operation in close proximity to opening doors/windows or to fast moving (road or railway) vehicles or tunnels can distort readings.