I bought one, haven't used it yet. Seems neat but I haven't yet developed a need beyond the accu-stick I currently use.
https://www.sheltertree.com/1866-36...nd-ppe_miscellaneous/ott-accu-stick-pro-.aspx
https://www.sheltertree.com/1866-36...nd-ppe_miscellaneous/ott-accu-stick-pro-.aspx