Download the Safety Instructions included with the sensors:

Safety Instructions-en.pdf

Important!

<aside> ⚠️ Do not charge the sensor in sub-zero temperatures.

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<aside> ⚠️ Always wear gloves over the sensor while using it.

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<aside> ⚠️ Sensor values are indicative only and may not always be accurate.

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Always wear the sensor when working with power tools to ensure your vibration points are saved.