This inexpensive, hand-held, diffraction grating spectroscope will measure wavelengths of light from 400-700 nanometers (nm) with an accuracy of ±5 nm. Great for use with spectrum tubes or when doing flame tests. Students will better understand spectra after using this quantitative analysis spectroscope. Unit is housed in an unbreakable plastic case. Dimensions-overall length: 20 cm; scale length: 37 mm. Instructions for laboratory use are included.