Patent ID: 8323572

Claim:
A measuring device comprising: a first substrate; a second substrate bonded on the first substrate, the second substrate having at least two inflow ports, at least two outflow ports, and a injection port, wherein the two inflow ports, the two outflow ports, and the injection port penetrate the second substrate, wherein the first substrate includes: partition wall portions opposing to each other, and forming a first cavity between the partition wall portions, a first solution being stored within the first cavity, and forming at least two second cavities close against one of the partition wall portions, wherein each second cavity is provided adjacent to the first cavity, a second solution being stored within the respective second cavities independently of each other; and through holes provided in the respective partition wall portions to connect the first cavity and the second cavity to each other, and the through holes being adapted to capture an object to-be-tested introduced in the first cavity, the through holes being provided at a position where an object to-be-tested introduced into the first cavity cannot come into contact with a bottom surface and an upper surface of the first cavity, the measuring device further comprising: a first electrode in contact with the first solution; and a second electrode in contact with the second solution, whereby an electric-potential difference between the first electrode and the second electrode is determined, wherein the first cavity is connected to an external environment through the two inflow ports and the two outflow ports, and the second cavity is connected to the external environment through the injection port.