Things to note when using a spectrophotometer

　　1. The spectrophotometer should be placed in a dry room and on a solid and stable workbench when in use. The indoor lighting should not be too strong. In hot weather, do not use an electric fan to blow air directly to the spectrophotometer to prevent the bulb filament from lighting up unstably.

　　2. Before using the spectrophotometer, the user should first understand the structure and working principle of the spectrophotometer, as well as the functions of each operating knob. Before turning on the power, the safety performance of the spectrophotometer should be checked. The power connection should be firm, the power supply should be good, and the starting position of each adjustment knob should be correct before turning on the power switch.

　　3. When the spectrophotometer is not powered on, the meter pointer must be on the "0" scale. If this is not the case, the calibration screw on the meter can be used to adjust it.