Measure any amount of liquid from 5mL to 25mL with this convenient automatic measuring dispenser. A dispensing cup slides onto a delivery tube that is set in a 500mL (16 oz) storage bottle. Squeezing the bottle forces the desired volume of liquid through the tube and into the cup. When pressure is released, excess fluid returns into the bottle for spill free pouring of your measured amount. A hollow stopper serves as a dust cover. The bottle is low-density polyethylene; the cup and closure are polypropylene.