1. High borosilicate material has stable chemical properties.
2. Good sealing performance, no leakage when inverted.
3. Transparent single cover: Easy to open and close quickly, convenient operation, suitable for daily use and short-term storage needs.
4. Amber single cover: Good light-blocking performance, suitable for samples that need to be stored away from light.
5. Amber double cover: Suitable for long-term sample preservation in the laboratory and samples that need to be protected from light.
6. Transparent double cover: Better sealing performance, effectively preventing external contamination, suitable for long-term sample preservation in the laboratory or applications that require frequent sampling.

Working environment conditions:
1. Temperature range: Ambient temperature between 0℃ and 50℃, water sample temperature generally between 0℃ and 40℃.
2. Atmospheric pressure conditions: Usually used under standard atmospheric pressure. Pay attention to the impact of pressure changes on the saturation of dissolved oxygen.
Precautions:
1. When collecting water samples, ensure that the dissolved oxygen bottle is completely sealed. When filling the water sample, make sure there are no air bubbles in the bottle.
2. Water sample temperature: The temperature of the collected water sample should be as close as possible to the ambient temperature to avoid changes in the solubility of dissolved oxygen due to large temperature differences.
3. Cleaning and storage: The dissolved oxygen bottle must be thoroughly cleaned before and after use to avoid residue. Store it dry and try to use it exclusively.
4. Chemical reagent use: When using chemical reagents (such as potassium iodide, sulfuric acid, etc.), ensure that the purity of the reagents meets the requirements to avoid interference from impurities.
5. Temperature control: The operating environment temperature should be as stable as possible to avoid fluctuations affecting the solubility of dissolved oxygen.
6. Safety precautions: Pay attention to the safe use of chemical reagents during operation to avoid contact with skin or ingestion. The dissolved oxygen bottle is made of glass, handle it carefully to avoid dropping or scratching.
7. Regular inspection: Regularly check the integrity of the bottle body and cap. Replace them in time if any damage is found.