Holographic diffraction grating for teaching 1.3 usd/pc 600 lines 300 lines 100 lines 50 lines in china

manana ny fanamboarana makarakara faran’izay tsara diffologtion Holographic any Shina izahay

600 lines 300 lines 100 lines 50 lines for 1.3usd/pc

the size is 36mm x 38mm

$Holographic diffraction grating for teaching 1.3 usd/pc 600 lines 300 lines 100 lines 50 lines in china-MasterLi, China Factory, mpamatsy, mpanamboatra$