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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
4.4 ★★★★★
Based on 500 reviews
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Product Reviews
★★★★★ 5
Great for chewers!
Size: Large, Color: Ball-Blue
We have a super high energy one year old pup who destroys practically every toy she gets. This one is excellent! It makes a fun but not annoying sound and she hasn’t been able to destroy it yet. The test hole is a fun addition to keep her busy.
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Reviewed in the United States on November 16, 2025
★★★★★ 5
Very sturdy toy for aggressive chewers
Size: Large, Color: Bone-Blue
My 80-pound American Bully loves this toy. It is very sturdy. Good price. Highly recommend.
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Reviewed in the United States on April 24, 2026
★★★★★ 1
My Dog Loved It—Until It Stopped Working
Size: Large, Color: Ball-Red
I purchased this treat-dispensing dog toy for my German Shepherd, and for the first couple of days it worked exactly as advertised. When rolled or tossed, it made an engaging sound that immediately caught my dog’s attention and encouraged him to interact with the toy to get the treats out. He absolutely loved it.
Unfortunately, after only a few days, the sound feature stopped working. Then it mysteriously started working again for a short period, so I thought the issue had resolved itself. However, it has now stopped completely. No matter how much I shake, roll, or toss the toy, it no longer makes any sound.
I went out of town and didn’t realize the return window had passed while I was gone. By the time I returned, the return deadline had already expired, which was disappointing because I would have returned it when the problem first appeared.
Based on my experience, I cannot recommend purchasing this toy. While many of the reviews seem positive, perhaps I received a defective unit. It’s disappointing that it stopped functioning properly after barely a month of use.
That said, my dog genuinely enjoyed it when it was working, and I would appreciate it if the manufacturer would stand behind their product and offer a replacement as a courtesy. I would be happy to return the defective toy. If a replacement performed as intended, I would gladly reconsider my opinion.
For now, however, I am very disappointed with the functionality and reliability of this product.
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Tough
Size: Large, Color: Bone-Blue
Somewhat large and a bit heavy. Best for a large dog. Very tough and durable.
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Durable for big dogs
Size: Large, Color: Ball-Red
It has a squeaky inside very tough doors loved it.
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Reviewed in the United States on May 24, 2026