OPL Pocket Diffraction Grading Spectroscope

OPL Pocket Size Diffraction Grading Spectroscope. It has fixed slit and fixed focus, with a 600 lines per millimeter fine quality diffraction grating and is smaller than the OPL Teaching Spectroscope. The spectroscope is constructed of stainless steel and black acetol and comes packed in a blue lined transparent case. It measures 55mm long, 12.5mm wide, and weighs 31 grams.