@Puttovr, while I appreciate your enthusiasm and acknowledge the accolades that your design has received, I am still of the opinion that a measuring tape and 'standard' NTP marker are a far more accurate measure of nearest to the pin. In an instance where the difference could be a couple of centimetres (which can be hard to judge by eye), a tape measure leaves no marker on the putting surface at all. So regardless of the fact that your marker has no noticeable interference of a rolling ball, i still worry about the 1 in 1,000,000,000 chance that when I chip my ball and it lands directly on top of your marker and offers me no check on the green, i would be pissed.
I would be more than happy to use your design as a regular marker to mark my ball on the green without interference to my playing partners, but with regards to NTP measurements I am more than happy to reach for the tape.
Edited by browniejr, 02 May 2018 - 10:20 PM.