For safety, do not turn on the device if there is a visible fault; contact us for assistance. Ensure to remove the black rubber protective cover before taking measurements. Regular maintenance is essential; clean the sensor probe monthly to avoid measurement errors from attachments. Use a gentle water flow to clean the sensor's outer surface; for stubborn dirt, a soft, damp cloth is recommended. Calibrate the device before each use, and for ongoing use, calibrate once a month, adjusting based on application conditions., Manufacturer: TUdcgjSXF