The Kuhn Rikon Ratchet Grinder is a good choice for people with arthritis because it is operated by flipping a large comfortable handle instead of twisting the mechanism.
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Pro Comfortable grip on the handle
The ratchet mechanism with a large handle is easier to use for people with arthritis or weaker grip than the usual "hold and twist" kind.
Pro Faster than most traditional grinders
Since it's easier to just flip the handle back and forth than twisting the cylinder on traditional pepper mills, this grinder can produce the same amount of ground pepper about 1.5 times faster.
Pro Easy to refill
There is a small hinged window on the side, that opens up and you can easily refill the grinder with peppercorns.
Pro Suitable for most dry spices
The Kuhn Rikon grinder can be used for grinding salt, peppercorns and other dry spices, like coriander or cumin seeds, or dried rosemary.
Con Can't be washed
This grinder can't be pulled apart and washed. If you want to use different spices, the only way to clean it is to grind some coarse salt through it.