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Description
SMART SENSOR ST8990 Portable Multi Gas Detector 4-in-1 O2 LEL CO H2S Gas Detector Tester Monitor with Digital LCD DisplayThe Multi Gas Meter is a portable and handheld instrument that is capable to use continuously monitoring four different gas: O, LEL, CO, HS, 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),
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
Specifications
| Adapter Plug | EU Plug |
| Brand | N/A |
| Color | Yellow |
| Gross Weight | 0.529kg |
| Volume Weight | 0.396kg |
| Package Length | 20.300cm |
| Package Width | 11.600cm |
| Package Height | 7.500cm |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Best Skin cleanser
Best ever. Deep cleans pore and I can see makeup melting off the face once you wash with this. Post results: Super clean soft skin, my face shines. Been using only for 2 weeks now, so cannot comment on Pore size reduction.
Extra sensitive eczema skin approved.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Great product
Size: 25 Count (Pack of 6)
My favorite facial wipes. Gentle to your skin, no alcohol, no burning on the eyes! These wipes clean well make up and don't get dry in the package. Expensive though, hope the price won't go up to make us give up on them.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
The only thing that works for me
Size: 50 count (Pack of 1)
I love these face wipes so much. I cannot use soap due to all the problems I have with my skin. It's so finicky.. I have rosacea with painful P&P and also flare ups of adult acne. I take a med to keep my oil production under control, but that means I end up with a few flakey patches on my cheeks. These are the ONLY face wipes that I've found that not only remove almost all (more on that in a moment) of the makeup I'm wearing, but also seem to help keep my redness under control. I've tried Aveeno Ultra-Calming wipes which profess to help with redness and even those are way too harsh for my skin. The Aveeno wipes make my face sting horrible, leave a greasy residue, and have a smell that is not very pleasant. The Simple wipes take off WAY more makeup than those, or any other wipe, I've tried and leave my skin feeling actually clean and calm.
The only routine that I've found that keeps my skin looking decent is to use these to remove the majority of my makeup and then follow up with Simple Micellar Water
on a cotton pad to remove any further traces. I follow that up with a few spritzes of
(rosewater is supposed to help with redness too) and then moisturize with
- which doesn't have SPF (which makes my rosacea flare up). It sounds like a lot of steps, but it takes me 3 minutes, tops.
I'd just like to add too for those saying that these don't remove waterproof mascara - well, yeah. I would want neither a "gentle" face wipe that was harsh enough to remove waterproof mascara, nor a mascara that was wimpy enough to be removed with a gentle wipe... that would mean it would also come off every time my eyes watered or even just blinked. Just use an oil-free eye makeup remover before using these.
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Reviewed in the United States on March 2, 2016
★★★★★ 5
great clean.
Size: 50 count (Pack of 1)
These get my face clean and exfoliated. I love them.
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Reviewed in the United States on April 2, 2026
★★★★★ 5
The best makeup wipes
Size: 50 count (Pack of 1)
The best makeup wipes- soft and fast and they smell great!
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Reviewed in the United States on February 5, 2026