The new Gretag Macbeth ruler kit enhances your ability to scan and protect your test charts! The new ruler no longer allows the Eye-One device to come in contact with the chart - avoiding any possible smearing or scratching. The ruler is usable as a standalone component or together with the new backup board. The new backup board provides an easy one-hand operation with a target clamp that holds substrates up to 3mm thick. Backup board contains a white surface and folds for easy portability.