The present invention provides a urine meter (40) having a housing (14) which includes an inlet (16) and an outlet (20). The housing (14) further includes a first measurement chamber (24) and a second measurement chamber (26) arranged such that liquid entering the inlet (16) enters the first measurement chamber (24) before passing to the second measurement chamber (26). The housing (14) is further provided with a non-return valve (42) between the first and second measurement chambers (24,26) which, in use, prevents the flow of liquid from the second measurement chamber (26) to the first measurement chamber (24).
