A measurement circuit includes a switch unit with a number of keys selectively pressed to output different resistance regulating signals. The multi-stage in-line cartridge ejectors can improve the system performance by increasing the amount of recirculated hydrogen. Next, a layer of a coatable inorganic material is coated on the substrate, wherein the coatable inorganic material is an oxide, in which the chemical element constitution is more than one element selected from the group consisting of Te, Al, Zr, and Ti. A plurality of coupling elements secures the body to the garment cuff in an engaged position.