SR-1800
Writing implements
Readable marks and unreadable marks depend on the writing instruments used. This can also
differ according to the light source that the reading sensor uses.
Relationships between sensors used for OMR (light source) and writing implements
Light source
wavelength
Color tone
Readable mark colors
and writing implement
Unreadable mark colors
and writing implement
940nm
(standard)
Infra red
Color: black (pigment)
Writing implement: pencil
Color: other than black
Writing implement: other than pencil
660nm
(*Option)
Visible light
(red)
Color: black, brown, blue, green, purple
Writing implement: pencil, fountain pen,
water/oil base ballpoint pen, water/oil
base marker
Color: red, orange, yellow
Writing implement: items in above
colors
Hopper
Place where readable sheets are set.
