Model Number: HFP-1403-O2#2285-#7835 Brand Name: Hua Fan Qin Lu Key Specifications/Special Features: HuaFanQinLu portable gas detector is a handheld, single-gas detector that uses an electrochemical cell sensor to monitor oxygen (O2) levels consistently, has audio, visual, vibration alarms, which alert simultaneously when O2 reaches the preset low and high alarm levelsThis detector is used to indicate potentially harmful levels of O2 gas naturally occurring in the environment, in variety of occupational settings such as petroleum refineries, tanneries, sewage treatment facilities, paper mills and in other personal safety, educational and ambient monitoring applicationsDetector has an alphanumeric LCD screen show the gas type monitored, 2-alarm set-points, the alarm level (low or high) can be adjusted by the user, it is operated and adjusted with buttonsThis detector is factory-set to alert a low-alarm condition when the level of O₂ reaches 18 % volume and high-alarm condition when O₂ reaches 23 % vol
In low-alarm conditions, audible alarm beeps, visual alarm flashes and the unit vibrates once per second
In high-alarm conditions, the audible alarm beeps, the visual alarm flashes faster and the unit vibrates twice per second
To ensure performance, the detector tests its built-in lithium battery automatically when boot
Self-test verifies the integrity of the battery, sensor and circuitry

Basic parameters:
Size: 4.5 * 2.1 * 1.8 inches
Weight: 3.7oz
Sensor type: electrochemistry method
Destination gas: O₂
Response time: ≤20s
Time display: can display year, month, day and hour
Display: LCD
Alarm: audio visual vibration
Temperature range: - 20 to 50°C
Celsius humidity: 15-95%RH (no condensation)
Battery type: CR2 CR15H270 Lithium battery
Power supply: 1 high-energy battery (changeable)
Charging time: 3-5H
Charging voltage: 5V DC