I use this pen every day and yet had still not change my mine. The quality of this product is unique and very good use in everyday life on the construction sites. The pen writes everywhere, that is on wet, rough, wet, smooth, no matter what surface farbigen-. I've even driven so far to the extreme that I have used it underwater where generally fail or soften any pencils.
With the support and the stable pin function he is my everyday, best friend always a helping hand grips me when I need him.
