I use my fingers:
When I spread my index finger and middle finger, not entirely as far as they can go, but rather far, that's 10 centimetres.
Thumb to pinky is 22 centimetres. These two are often precise enough for me.
When I spread my index finger and middle finger, not entirely as far as they can go, but rather far, that's 10 centimetres.
Thumb to pinky is 22 centimetres. These two are often precise enough for me.
Index to middle finger is 15cm for me, without stretching uncomfortably, and thumb to little finger ("pinky") is 26cm. Outside to outside of the fingers.
(For comparison I am a 1.88m -- 6'2" -- male.)
This is why I like large smartphones. The original tiny ones felt like using cocktail sticks as chopsticks to me: they were tiny and toylike and required superhuman precision.
6.5" phones are just about usable, especially with swipe-typing. Almost all Blackberry models were unusably small and cramped for me, but the Passport was OK.