Moire Fringe Products Category : Optical Products > Optical Instruments INQUIRY Details The size of observation hole is 30x21mm, out size is 50x50x3mm.Showing interference phenomenon of light through two transparent film. We called it Moire Fringe. Send Inquiry Name:* E-mail:* Tel: Content:* Verification Code:* (All * must be filled in) [ Previous: ] [ Next: ] Related Products The Poisson Bright Spots Presenter Three-Color Light Source A Linear Laser Light Source Three-Color Light Source B Three-Color Light Source C Myopia Hyperopia Demonstrator Three-Color Light Source D Newtons Rings