What you need
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The reading changes all the time, there is some dust or dirt in the sensor.
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The problem is actually, how do you open it...
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There is a very thick and well glued label on the back which hides the screws which need to be removed. Then it is easy.
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When everything is disassembled, generally a cleaning of the surfaces is enough to make it work again.
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Do not forget to readjust the screws tightening the sliding joint. Is is on the side.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
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