(1) 500 µm Search× Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Germanium-Coated Silicon Nitride Grids $750.00 TEM Aperture Grids – Single Opening $140.00 TEM Silicon Nitride Grids – Single Window $180.00 – $375.00 X-Ray Silicon Dioxide Windows – Single Window X-Ray Silicon Nitride Windows – Single Window $375.00 – $500.00