Hourglass have 120 balls.
About 1 minute. (Clock error is about 15 seconds.)
Added 3 minute hourglass.(ver.2.0)
You can turn the hourglass over with your finger.
It can't measure the exact time. If you want to measure the exact time, don't use it.
There is a probability that the ball will clog and stop about once every 50 times.
The error will be even larger if the fps drops due to the usage of old devices and other apps.
I tested these smartphone
SHARP SH-01L Android9
SONY SOV34 Android8.0.0
SHARP 403SH Android5.02
About 1 minute. (Clock error is about 15 seconds.)
Added 3 minute hourglass.(ver.2.0)
You can turn the hourglass over with your finger.
It can't measure the exact time. If you want to measure the exact time, don't use it.
There is a probability that the ball will clog and stop about once every 50 times.
The error will be even larger if the fps drops due to the usage of old devices and other apps.
I tested these smartphone
SHARP SH-01L Android9
SONY SOV34 Android8.0.0
SHARP 403SH Android5.02
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