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Watching the SpaceX Demo-2 launch preparation livestream, I saw both Bob and Doug using some sort of little gadget. It looks like a chunky cell phone, or a flat gopro. It appears to have an LCD on the back side (the side we can see).

identify object 1 identify object 2

pictures and learnings from the Saturday launch- he removes it from his leg pouch and sticks it above the monitor. I assume it is velcroed on.

identify object saturday 1 identify object saturday 2

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    $\begingroup$ This question was posted only a few seconds before a similar question. If one of them receives an answer, the other should be closed as a duplicate. $\endgroup$ – DrSheldon May 27 '20 at 19:50
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    $\begingroup$ @dragongeek here's the timestamp: 1:53:25. $\endgroup$ – tedder42 May 28 '20 at 8:56
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    $\begingroup$ Guesses: - Accurate clocks, synchronized in-person with the ground equipment. You can't have enough clocks in space travel; accurate timing determines whether you can execute precise maneuvers at all. - Wireless receiver for telemetry or radio communication from the suits - Matching retro iPods $\endgroup$ – CourageousPotato May 30 '20 at 2:43
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    $\begingroup$ This looks like what was called in shuttle an "egg timer". Just a cheap LCD timer with Velcro on the back. Will seek confirmation. $\endgroup$ – Organic Marble May 30 '20 at 16:59
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    $\begingroup$ Picture of the shuttle eggtimer here i.imgur.com/nmiPqK4.jpg (red arrow) $\endgroup$ – Organic Marble May 30 '20 at 17:02
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Not entirely sure of his source, but Scott Manley seems to assume these are portable timers. Timestamp of 5:00 at this Youtube Link.

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  • $\begingroup$ That's great! Accepting based on DJSnM's knowledge, if anyone comes along with a more solid source I'll unaccept and move it to theirs. $\endgroup$ – tedder42 Jun 8 '20 at 21:03

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