Description
Gem Spectroscope Focusing Prism Gemstone Spectroscope with Adjustable Focus Gemology Spectrometer 400 700nm Range for gemological Testing, Antique, Jewelers, Fairs, and Gemstone Identification industrial_Oct2022 the maximum speed is 20000RPM PZN 11038827 LACALUT Interdental sold2026 B0CY2VTLLF Style:PVD Coated(black&grey) the maximum speed is 20000RPM long transmission distance and good performance