SmartMark Tape Measure Accessory

The SmartMark Tape Measure Accessory from SMC magnifies and marks. This $5 magnifier from their Master Mind Tools line attaches to any standard 1″ tape and makes a pinpoint mark by pushing it down when you’re at the desired length.
There’s even a video — I guess for those unclear on the concept. The SmartMark is a little more complicated than a pencil, but, for some of us who are approaching old fartage and still haven’t gotten used to the damned bifocals, it just might help.
SMC [Manufacturer’s Site]
I watched the video for the sake of it, and I don’t understand it.
This tool is to help you see the tape measure and give you a more accurate reading if your vision is impaired. What good is the marking gauge when it’s as small as a brad point?
Talk about niche markets