Is there a tool to make opening cans and jars easier for elderly parents?

I've tried most things out, as I have arthritis that affects my hands. I still like a gizmo that looks like a wrench and fits over the top of a jar. There are little holes in it to calibrate it for the size of cap. However, it doesn't fit everything. I got that years ago at a hardware store.

You may want to search online for "Arthritis friendly" or something, and also try the Arthritis site at http://www.arthritis.org/.
Carol

My Mom uses and electric jar opener. She sets the jar inside of this contraption. This ring comes down over the jar, tightens, then twists the lid open. Works really well:

http://www.amazon.com/s/?ie=UTF8&keywords=electric+jar+opener&tag=yahhyd-20&index=garden&hvadid=43148598011&ref=pd_sl_35r7nhsgum_b

http://www.amazon.com/s/?ie=UTF8&keywords=electric+jar+opener&tag=yahhyd-20&index=garden&hvadid=43148598011&ref=pd_sl_35r7nhsgum_b

There use to be grippers you can put over the lid to open a jar with-along with hot water-----it worked here..
Best~
Hap