These moulded plastic cup receivers are for recording the pulse from an artery. The cup receiver is pressed over the limb at artery site and small changes in volume in the cup are transmitted through flexible tubing to a read-out device, such as a Tambour. The riffled tube connector on back has an inside diameter of 3 mm (1/8 in). The cup is 45 mm (1-3/4 in) diameter and 6.5 mm (1/4 in) deep. It is available in two shapes: round and with a flattened edge for getting into hard-to-reach spots.