Abstract: A tray is adapted to be rotatably mounted on chemical analysis apparatus and to receive a plurality of cups of fluid samples for chemical analysis. The tray is formed of a plurality of discrete arcuate segments independently removable from, and replaceable onto the analysis apparatus to form a circular composite tray when all the segments are present. The tray is provided with a plurality of replaceable metering tips, one per fluid sample cup, which may be radially aligned with the cups. The tray segments are mounted on a carrier which can be removed from the chemical analysis apparatus with all the tray segments as a unit.