Compare webshops (1)
Sponsored links · Some shops pay us a fee
Sort by:
Shops with other sizes
Rigid, 1mm thick L-shaped laminated plastic Millimeter markings accurate to 0.1mm or better Overall size is 105mm x 105mm Gray areas have a reflectance value of approximately 18% Alternating black and white bars (1cm) permit measurements from grossly over- and under-exposed photographs