Activation
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Unscrew the cap and carefully remove the battery cartridge
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Insert two 3.6V AA batteries (typical 1.5V AA batteries will not work here)
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Re-insert the battery cartridge and screw back on the cap. The arrows on the sensor and the cap must match up when screwing back on the cap.
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If you purchased the optional magnetic base, screw it onto the bottom now.
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Turn on the sensor by pressing and holding the power button until you see a green light appear
Reset
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Unscrew the cap and carefully remove the battery cartridge
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Remove both 3.6V AA batteries
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Re-insert both 3.6V AA batteries and re-insert the battery cartridge into the slot
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Screw the cover back on. The arrows on the sensor and the cap must match up when screwing back on the cap.