Hanvon Graphicpal 0504 - Manual (Page 53)

MAINTENANCE
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purchased the product does not have the pen holder as mentioned
above, please using tweezers, grasp the nib and draw it out. Once
removed, a new nib may be inserted into the pen.
5.3 Cautions
Do not put the tablet on a metal surface, such as iron or aluminum
alloys.
Due to a CRT monitor’s electromagnetic radiation, do not use the
drawing tablet too close to a CRT monitor.