bk7 slot

bk7 slot   Dan bk7 slot

N-BK7 is a Schott designation for the most common Borosilicate Crown glass used for a wide variety of visible applications

BK7 optical glass OPTIMUM TRANSMISSION RANGE 350nm BK7 Cute, KTV microphone, BT , 1200mAh battery for 8 hours of work, support TF card BT playback modes, variety of funny sound effects

ufalion168 N-BK7 is a Schott designation for the most common Borosilicate Crown glass used for a wide variety of visible applications  BK7 optical glass OPTIMUM TRANSMISSION RANGE 350nm