Introduction:
The Multi-Gas Meter is a portable and handheld instrument that is capable to use continuously monitoring four different gas: O2, LEL, CO, H2S, when detected these gases, all the concentration will displayed on the LCD. The unit also provided user to configure high and low alarms, also STEL/TWA alarm function. The unit has audio and visual alarm once the alarm condition is exceeded.

Features:
It is capable of detecting 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide(H2S), oxygen(O2) and combustible gas(LEL).
Premium material and selected top quality electronic components ensure excellent sensitivity and accurate measurement.
Pocket-size, light weight and ergonomics design make it convenient to carry and use.
Built in 2500mAh lithium-ion battery after a full charge allows this alarm to work for 8 hours operation, and work about 6 hours with external gas sampling pump.
Backlight enables you to see the value clearly even in dark environment.
2 alarm methods: audio alarm and icons showed on the screen.
Various functions meet your demand: gas monitoring, peak value display, low alarm setting mode, high alarm/TWA setting mode, etc.
It is suitable to be used in petroleum, chemical industry, metallurgy, refining, etc.

Specifications:
Brand: SMART SENSOR
Model: ST8990
Color: Yellow
Material: ABS
Carbon Monoxide Range: 0~999ppm
Hydrogen Sulfide Range: 0~500ppm
Oxygen Range: 0~30%VOL
Combustible Gas Range: 0~100%LEL
Operation Current: 220mA
Short Circuit Current: 3A
Operation Voltage: 3.7V
Maximum Open Circuit Voltage: 4.2A
Battery: Lithium battery
Battery Capacity: 2500mAh
Display Type: Segment type LCD
Operation Humidity: 15%~95%RH
Operation Temperature: 10?~50?
Storage Temperature: 0~40?
Item Size: 11.45 * 6.44 * 4.45cm / 4.50 * 2.53 * 1.75in
Item Weight: 200g / 7oz
Package Size: 20 * 11 * 7cm / 7.87 * 4.33 * 2.75in
Package Weight: 475g / 16.8oz

Notes:
-Gas monitor only, other accessories are not included.
-Due to manual measurement, there may be deviation.
-Due to photograph light or other reasons, the item in picture and material object may have slight difference, please in kind prevail.
-Please read the manual carefully before you use it.

Packing List:
1* Multi-Gas Meter
1* Manual
1* Charging Adaptor
1* USB Cable