SP-125 Direct-Reading Student Spectroscope


SKU: SP-125 Category:


The Direct-Reading Spectroscope is a replica diffraction grating instrument with an internal scale that shows students the wavelength in nanometers.

It is used for the detection and identification of elements by their characteristic spectral emission lines.

The light source may be from salts in a flame or from electrically excited tubes filled with elemental gases, such as helium or nitrogen. It may also be used to observe the more prominent Fraunhofer lines in the solar spectrum as well as the absorption spectra of solutions such as those that contain chlorophyll or blood.

The grating has 600 lines per mm. The scale reads from 380 to 720nm and has an actual length of approximately 35mm. The entire spectrum can be seen at once.

The slit is adjustable and a reflector is provided to back-light the scale. The housing is a one-piece aluminum casting, finished with light gray polyurethane paint, mounted on a stainless steel post and supported on a cast iron tripod base.

Additional information

Weight 7 lbs
Dimensions 15.75 × 9.75 × 5.75 in

Replacement Parts

Please click part to view and order.

RP-801 Eyepiece, with diffraction grating

RP-802 Scale, wavelength

RP-803 Slit assembly, mounted in tube with slit cap and collimating lens

RP-804 Slit cap with thumbscrew

RP-805 thumbscrew

RP-806 Support Post

RP-807 Tripod base

RP-808 Mirror support arm


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Instructions:  Student Spectroscope

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