For a handheld device to be successful, it must be comfortable, functional, accurate, and meet any special requirements of its application.
Developing a Handheld Device: Technical Challenges and Pitfalls lays out the aspects of an effective handheld design.
It covers:
Ergonomics of the Hand
Beginning the Design
The Meter, Display, and Keyboard
Power Supply Design
The Enclosure
Teardown Examples
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