A nitride semiconductor laser device of high reliability such that the width of contact between a p-side ohmic electrode and a p-type contact layer is precisely controlled. As the swing drive shaft 33 is driven to revolve, all the nozzle vanes 31 are driven to turn by a same angle by way of the driving lever 21 and the coupling ring 18 linked to it. The composition forms a gel under environmental conditions in which B is insoluble, through formation of B aggregates. The appliance member includes a housing which includes a snap-fit arrangement coupled with the appliance. The second circuit produces a second rich electrolyte solution, which is also forwarded to primary metal value recovery. The calibrating switch module generates a calibrating result according to the first and second control signals.