What does the 'EF' error mean on the GP-100 thermometer, and what battery size does it use?
Based on the Harbin Xiande GP-100 manual, here is the information regarding your issues: Battery Type: The GP-100 uses a 18650 Li-ion rechargeable battery.…
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Harbin Xiande Medical Infrared Thermometer GP-100 User Manual — questions & answers
Read product questions and troubleshooting answers linked to Harbin Xiande Medical Infrared Thermometer GP-100 User Manual.