Providing a fining structure for parts of optical element by which fiing of parts of optical element with high accuracy can be achieved aer positional adjustment in axes with an arrangement the positional adjustment in axes of parts of optical element is easily achieved before the fixingg of the pars of optical element. The toner bottle is made up of a mouth including a toner outlet and a cylindrical wall, and a body including a circumferential wall and a bottom. An indicating member is coupled to the trigger and is axially aligned therewith, and a bias element is coupled to the indication member and is coaxial to the longitudinal axis. Other embodiments are also described and claimed. The reactor further includes a connector leading from the chamber to the heater for transporting a mixture of the reactant and gas sample, and wherein the heater heats the mixture of the reactant and gas sample. The methods of the invention can be employed in aqueous and nonaqueous conditions.