SMART SENSOR ST8990 Portable Multi Gas Detector 4-in-1 O2 LEL CO H2S Gas Detector Tester Monitor with Digital LCD Display - Yellow/EU Plug •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. •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 •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 •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. Package included: •1 x Multi-Gas Meter •1 x Charging Adapter •1 x USB Cable •1 x English and Chinese User Manual