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A dew point meter is an instrument that can directly measure the dew point temperature. Cool a mirror in the humid air of the sample until droplets (or ice crystals) appear on its surface; the average temperature of the mirror at that moment is the dew (frost) point temperature. When in use, the pipeline for drawing in the sample air must be kept clean; otherwise, impurities within the pipeline will absorb or release moisture, resulting in measurement errors. Daily maintenance and usage precautions for the dew point meter: 1. The measuring instrument should be placed in a safe location to prevent it from being damaged. Avoid severe vibrations. 2. Be aware of corrosive gases. 3. The probe should be cleaned and calibrated after being used for a certain period of time, with a calibration interval of one year. When verification is needed, contact the manufacturer. 4. When adjusting the gas flow rate, the control needle valve should be opened slowly so that the flow rate remains at 0.5–0.6 liters per minute. If the flow rate exceeds 1 liter per minute, a message indicating that the flow rate has exceeded the limit will appear on the LCD; in such cases, the flow rate should be reduced to the specified value. (Excessive flow will damage the electronic flow sensor.) 5. After using the dew point meter for a day (on battery), it should be charged promptly. To charge it, simply connect the power cable to a 220V outlet; there is no need to turn on the power switch, as the instrument will charge automatically. The charging time is generally more than 5 hours.