The United Scientific DFG300 diffraction grating has 300 lines per millimeter, measures 45mm x 60mm (H x W), and is protected by glass plates. This replacement diffraction grating with 300 lines per millimeter splits light into multiple beams for analysis in light and optics experiments. The grating measures 45mm x 60mm (H x W) and has a viewing area of 30mm x 45mm (H x W). Dual glass plates protect the grating from damage and provide visibility. It is for use with the United Scientific SPECT02 intermediate spectrometer.

United Scientific Supplies manufactures laboratory supplies and science education products. The company, founded in 1992, is headquartered in Waukegan, IL.