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;It's really important to handle the kit with care and to avoid touching the planar surface. Every modification of the planar surface, like scratches or dirt, can make the calibration system unreliable.ăăăăźćæ±ăă«ăŻććæłšæăăćčłăăȘèĄšéąă觊ăăȘăăăă«ăăŠäžăăăèĄšéąă«ć·ăæ±ăăä»ăăăăăăšăăăŁăȘăăŹăŒă·ă§ăłă·ăčăă ăäžćźćźăšăȘăăăšăăăăŸăă
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