Holographic diffraction grating 36x38mm 600 mistari 300 mistari 100 mistari 50 mistari XNUMX nchini China

Holographic diffraction grating 36x38mm 600 lines 300 lines 100 lines 50 lines

$Holographic diffraction grating 36x38mm 600 mistari 300 mistari 100 mistari 50 mistari XNUMX nchini China-MasterLi, Kiwanda cha China, muuzaji, Mtengenezaji$