Models Available:
S50 'B' Polarised Retro
S50 'C' Diffused
S50 'E' Fibre Optic
S50 'FG' T/Beam
S50 'L-B' Polarised Retro Laser
S50 'L-C' Diffused Laser
S50 'L-FG' T/Beam Laser
S50 'M' Background Suppression
S50 'N' Foreground-Background Suppression
S50 'T' Polarised Retro for Transparents
S50 'U' Luminescence
S50 'W' Contrast
S50 'Y' Distance