Sinn’s UX model has a case filled with liquid, which, because it cannot be compressed, makes the watch pressure-resistant to just about any depth. The liquid expands at higher temperatures, so the back is composed of two parts and contains a membrane that allows the inner part to move slightly outward. The watch contains a quartz movement, because the liquid would interfere with the oscillations of a balance. The movement is also lubricated with special oil so that it can function at extreme temperatures ranging from -45° to +80° Celsius, or -49° to +176° Fahrenheit.
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