NOVELTY - The gas sensor testing device comprises a chamber, a first electrode wire (18) , a second electrode wire, a cap, an electric source such as a current source, a controller, and a device. The chamber includes a wall (13) having an inside surface (14) and an outside surface (15) and a perfluorinated ionomer resin, and comprises a tube. The inside surface defines a gas channel. The wall includes a water molecule, an electrically conductive hydrating polymer, a salt, an ionic liquid, or an ionic polymer. The first electrode wire is coupled to the outside surface of the wall.    USE - The device is useful for testing a carbon dioxide sensor, hydrogen sensors, oxygen sensors, a carbon monoxide sensor and natural gas sensors.    ADVANTAGE - The device exhibits improved reliability, enhanced performance and rapid recharging capacity, and ensures sensor accuracy and system integrity thus providing highly accurate readings.    DETAILED DESCRIPTION - The gas sensor testing device comprises a chamber, a first electrode wire (18), a second electrode wire, a cap, an electric source such as a current source, a controller, and a device. The chamber including a wall (13) having an inside surface (14) and an outside surface (15) and a perfluorinated ionomer resin, and comprises a tube. The inside surface defines a gas channel. The wall includes a water molecule, an electrically conductive hydrating polymer, a salt, an ionic liquid, or an ionic polymer. The first electrode wire is coupled to the outside surface of the wall, and contacts the outside surface in a helical pattern. The second electrode wire is coupled to the inside surface of the wall. The first and second electrode wires: are operated to generate a current through the wall when a voltage applied across the first and second electrode wires; include an electrically conductive material. The current is effective to electrolyze the water molecule to generate a gas; are painted on to the outside and inside surfaces respectively; and are adhered to the outside surface of the wall by first and second adhesive layers respectively. The cap is attached in a gas-tight manner at one end of the chamber, and includes a non-electrically conductive material and a hole effective to allow the first electrode wire to pass through the hole. The electric source is disposed in the cap, is coupled to the first and second electrode wires, and is effective to generate the voltage across the first and second electrode wires. The first electrode wire is coupled to the outside surface through a vapor deposition or sputtering. The electric source and the wires are effective to generate a current through the wall. The controller is coupled to the electric source, and is effective to control an output of the electric source. The device is coupled to the firs and second electrode wires. When the electric source is operated to generate the voltage, the device is effective to generate a signal in response to the current and the voltage. The signal is effective to indicate an amount of the gas. An INDEPENDENT CLAIM is included for a method for a gas sensor testing device.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a gas sensor testing device.    Gas channel (12)    Wall (13)    Outside surface (14)    Inside surface (15)    First electrode wire. (18)