The EXPERT DRY is a pen for marking and tracing of measure lines or drill holes for professional use. The refillable lead works on a universal range of surfaces. The slim barrel reaches even inaccessible areas and is particularly suitable for marking drilling holes. With the holder attached to the work clothes, the integrated sharpener allows for one-handed sharpening, without the need of putting aside any tool or of interrupting the productive work. The interlocking joint of of the pen and the holder ensure a safe fastening and provides a distinctive feedback; the angular shaped body prevents the pen from accidentally rolling away on even surfaces. A slotted drain at the sloped bottom of the holder ensures that the lead stays dry even in wet working areas. Rather than being a drawing or writing instrument, the appearance of the EXPERT DRY refers to the context of working tools.