1. Users should follow the security precautions listed below during the operation, maintenance, and repair process of this instrument. Otherwise, it may affect the protection provided by this instrument and the intended use scope. 2. Operators should not open or repair the instrument voluntarily. Otherwise, you will lose the warranty qualification. Please contact our professional staff to repair the instrument. 3. Please make sure the voltage of the power supply matches the voltage range of this instrument, which is illustrated in the instruction. If the power cable is damaged, it must be replaced. 4. Do not put anything on the power cord and do not put the power cord in a place where people frequently walk around. 5. The instrument should be placed in low humidity, with less dust, away from water resources, and avoid direct sunlight place to prevent damage to the instrument. 6. Turn off the power immediately after the operation is completed. Covering the instrument with a soft cloth to prevent dust.