in one embodiment , a sight tube flowmeter is formed of a plurality of fluoropolymer components welded together to form a unitary flowmeter body . the components can comprise a pfa upright sight tube having two end portions , a flow conduit extending therethrough and two fitting portions that are uniquely welded onto each end of the sight tube , and a fluoropolymer float device movable to various positions within the flow conduit depending on the flow level of the fluid flowing therethrough . the float device can be of conventional design or for those flowmeter embodiments where low fluid flow rates are to be measured , an elongate float can be utilized . the floats and , in particular , a designated portion thereof , are visible through the sight tube to provide visual indication of the position , and thus the flow rate of fluid flowing through the flowmeter . in addition , alternative embodiments include the implementation of the unique sight tube and elongate float design in conventional flowmeters .