Specification:
Sodium lamp: output wavelength: 589.0nm, 589.6nm,
Electric type; without buzzer; height adjustable; with metal lamp-chimney; three light windows, with strip ground glass.
Mercury lamp: output wavelength: 404.7nm, 435.8nm, 546.1nm, 577.0nm, 579.0nm,
Electric type; without buzzer; height adjustable; with metal lamp-chimney; three light windows, with strip ground glass.