I try to have the staff I support choose from a variety of keyboard because one size does not fit all (I'm looking at you, Microsoft). The one the works best for the most people has been the "Kinesis Freestyle Solo Ergonomic Keyboard". You will also need the "Kinesis Freestyle VIP Keyboard accessories kit" (the "kit" is the wrist rest and adjustable stand) and optionally the "Kinesis Low-Force Numeric Keypad". It's not cheap, but it can be adjusted to suit your seating and body position. You can find these products with a quick search on Amazon.com.
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I try to have the staff I support choose from a variety of keyboard because one size does not fit all (I'm looking at you, Microsoft). The one the works best for the most people has been the "Kinesis Freestyle Solo Ergonomic Keyboard". You will also need the "Kinesis Freestyle VIP Keyboard accessories kit" (the "kit" is the wrist rest and adjustable stand) and optionally the "Kinesis Low-Force Numeric Keypad". It's not cheap, but it can be adjusted to suit your seating and body position. You can find these products with a quick search on Amazon.com.