IRIS aperture drawing compass Makers Cabinet brass stainless steel 2-70mm RARE!

VINCENT ASSOCIATES UNIBLITZ D122 SHUTTER DRIVER CONTROLLER

UNIBLITZ D122 SHUTTER DRIVER

Melles Griot Optics Metric Beam Dump 10mm Aperture NEW

ATM PRODUCTS 8" Diameter USA Standard Testing Sieve Ins 3/4 Aperture 19.00 mm

KONING "UNIVERSITY" 32 mm Focal Length ~38 mm Clear Aperture M.C. Lens

Assorted Lot of KIMBALL PHYSICS Aperture 68-412100 Through 68-412140

Brass Steel Sieve Soiltest 8" x 4.5" USA Standard Testing Aperture 75 μm