WINTACT WT8821 Oxygen Detector Independent Oxygen Gas Sensor Warning-up High Sensitive Poisoning Alarm Detector

specification
1. Measurement range: 0~25% VOL
2. Maximum overload: 30% oxygen
3. Response time: <15 seconds
4. Sensor type: electromagnetic O2 sensor
5. Use ambient humidity: 15~90% RH
6. Power: 3X1.5VAA battery
Package Included
1 x Oxgen gas detector (without battery)
1 x manual