I got this years ago when I shot Bianchi Cup stuff. Don't think I ever used it, don't think the company is around anymore. Don't remember what it cost me.
It is a universal loupe and three separate lenses that are +o.50 sph, +0.75 sph and +1.00 sph. Attaches to eyeglass temple and helps one focus on iron sights better.
I have no idea what the above really means but that's in part what the literature says.
$15 and it's yours TYD. First I'll take it followed by PM. Payment by check, Paypal. Etc.
PM me and I'll tell you what I can.