DESCRIPTION
Characteristics:
- It is convenient to use because of its small size.
- The battery is chargeable(3.7V) that convenient to carry.
- Stable performance and high precision.
- Cheap and practical.
- Technical parameter:
- Oxygen concentration: 21%-100%
- Power: DC 9V/DC 3.7V
- Use life of oxygen sensor: 2 year
- Low battery alarm.
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