Which one of the following can not be used for measurement of time ?

Question

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Answer 1

"A leaking tap" is the answer because we cannot estimate when will the drop fall.
where as
⇒ simple pendulum shows time by its to and fro motion.
⇒ in olden days the time is estimated by the shadow of an object
⇒ blinking of eyes is rarely seen which blinks by time unless by reflex actions

Answer 2

"A leaking tap" is the answer because we cannot estimate when will the drop fall.

where as

⇒ simple pendulum shows time by its to and fro motion.

⇒ in olden days the time is estimated by the shadow of an object

⇒ blinking of eyes is rarely seen which blinks by time unless by reflex actions