High-quality, largeaperture optics produce sharp spectral images, while precision machining allows for precise rotation and accurate measurement. The Student Spectrometer is most popular in universities, where precision and durability are important. Resolution to 1 minute of arc 127 mm diameter, precision-engraved degree plate is complemented by 2 precision engraved verniers, one on each side of the instrument for convenient reading. lWider aperture optics 32 mm wide apertures on the telescope and collimator provide more light for brighter and sharper images. Rack and pinion focusing on both the telescope and the collimator. Focusing is easier and more precise. Rotatable Table for greater flexibility in measurements. Turn the table by hand for coarse adjustments. Use the fine lead screw for delicate adjustments. Complete with working instructions. Supplied in wooden carrying case.