I have a General 80560 mirror that I bought for checking the conditions (snow, leaves, etc.) in my VP2 funnel.
For reading snow depth for CoCoRaHS, I know that there is a parallax error if you don't get your eye close to the ruler where it is into the snow on the snowboard, but I am not keen on getting wet knees to really get down there.
It occurred to me this morning that maybe the mirror could be used to get a better view of the snow scale. It worked great and I could see the gradations quite well when I placed the mirror close to the snow. I think I'll do this from now on. I thought that I would pass this on as a 'hint'.
The mirror telescopes out quite a ways, but is not shown in the picture. Any similar mirror would work, it would not need to be this one.
Greg H.