I don't have one and not sure where I'd put it; my sister's husband asked her if she wanted one, but she said no. I think she would benefit greatly from one; she's a very visual person. Her excuse was where to put it. So my brain got to working and I suggested she attach it to a rod; like a roll up curtain rod. He could put a gear type deal on the end, the roll it up when no in use and then let it down when needed. I might have to try that.