The technical marker is an ideal tool for marking or making technical notes during construction or renovation work. Its small tip diameter ensures precise writing. The marker uses German-made ink that is permanent and free of xylene and toluene. With the DEDRA M89Z21 construction marker, markings and notes are protected from smudging caused by hand contact or water exposure. This marker allows writing on various surfaces, such as CDs/DVDs, X-ray films, glass, and metal.