Please check that the batteries are installed correctly.
To install the batteries the Non-contact thermometer:
1. Hold the thermometer upside down with the battery compartment facing up.
2. Turn the thermometer so that the arrow on the battery compartment is facing your body.
3. Open the compartment.
4. Place a battery with the positive side (bump side) up, sticking out of the top hole.
5. Place the other battery with the negative side (flat side) up, sticking out of the bottom hole.
6. Replace the cover and pull the trigger. The device should turn on.
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