Timex Datalink is flight licensed by NASA for house missions and is amongst the watches certified by NASA for house travel. The Casio G-Shock DW-5600C and 5600E, DW 6900, and DW 5900 are Flight-Qualified for NASA space journey. Digital watches usually have push-buttons that can be used to make adjustments. These are usually equally easy to use on both wrist. A drawback with LCDs is that they use polarized gentle. If, for example, the person is sporting polarized sunglasses, the watch may be troublesome to read as a outcome of the airplane of polarization of the show is roughly perpendicular to that of the glasses.

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