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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. T

    Star Testing

    David, Harrison's chronometers were made in the 18th century and were accurate to around 1/3 second/day. I don't know of any currently made transportable and mechanical watch or clock that could better that. Your Timex must have a quartz movement, a technology unavailable in the 18th century. John