The MarXman Standard Professional Marking Tool. 
 
With one push, it quickly, easily and clearly marks almost any surface. For jobs with fixing holes up to depths of 45mm. Each pen contains 250 bursts of removable, fluorescent green pigment and is capable of marking all surfaces including brick, metal, wood, pebbledash, porcelain and ceramic. The perfect drilling companion for electrical, plumbing, building jobs and much more.