A medical/surgical waste collection rover is described. The rover comprises a portable cart； a first waste container mounted to the cart, the first waste container having a connecting member for receiving a suction line through which medical/surgical waste is drawn into the first waste container； a vacuum source adapted to provide a vacuum to the first waste container to draw the waste through the suction line attached to the first waste container into the first waste container； a second waste container mounted to the cart； and a transfer valve disposed between the waste containers and operable between open and closed positions for allowing the transfer of waste material from the first waste container to the second waste container. The rover further comprises a fluid measuring system including: a float element in the first waste container that is configured to float on a liquid contained in the container； a reservoir mounted to the cart for storing one of water and a water-detergent mixture, said reservoir being selectively connected to said first waste container； and a controller mounted to the cart and configured to, after transfer of waste from the first waste container to the second waste container, cause water or the water-detergent mixture in said reservoir to prefill the first waste container so that said float element is subjected to an initial lifting from a bottom of the container to a zero point level； wherein the fluid measuring system is configured to determine the volume of liquid in the first waste container based on a distance of said float element from the zero point level.
