ADJUSTABLE SLI Circular blacked metal screen, 75mm dia with 12.5mm central aperture. A screw controlled, spring loaded precision slit, Provides a maximum slit opening of 4mm approx., with useful length of 10 to 12mm. mounted on a standard 6mm dia brass rod, the optical centre height is 80mm approx.
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Jalandhar Cantt., Jalandhar, Punjab