Dissolved Oxygen Meter DOG-2082X Please read the following instructions for safe operation before use. 1.Please observe whether the appearance of the instrument is damaged by the squeeze of the transportation before use. 2.Read the operating manual before use to avoid incorrect wiring . 3.After all wiring is completed, it must be checked carefully before sending power and confirming that the connected equipment is correct. 4.Please avoid the high temperature, high humidity and corrosive environment, and avoid direct sunlight. 5.Avoid using power supplies that cause surge interference. If there is surge interference, please separate the power supply of the instrument from other power sources.