2023 Spring Super Sale


Mouse over to zoom in

SMART SENSOR ST8990 Multi Gas Monitor Rechargeable 4 in 1 O₂ LEL CO H₂S Gas Detector Tester Sensor with Backlight Alarm Function LCD Display

SMART SENSOR ST8990 Multi Gas Monitor Rechargeable 4 in 1 O₂ LEL CO H₂S Gas Detector Tester Sensor with Backlight Alarm Function LCD Display

Price on the app only:

Already have TOMTOP APP

Scan the product's code to buy directly!

Note: Please update TOMTOP App to the latest version.


Download freely and enjoy extra offers!

Ship From:
  • China Warehouse
Please select a warehouse
Usually will be shipped in business days hours
The request failed! Please try again.
Sorry, it seems that there are no available shipping methods for your location.Please contact us for further assistance.


Ship to

United States
Stock in: china


  • eu
Please select a plug

For each user order no more 5 item(s)

Special discount has ended

Please note each user for only 1 item(s)

Preorder Add To Cart Out of Stock

Arrival Notice

if the goods arrival in 90 days,we will inform you by email!


Arrival Notice

Notification Subscription Success!

if the goods arrival in 90 days,we will inform you by email!

Notification Subscription Failed!

Error appeared,Please try again later!

Arrival Notice

Buyer Protection

  • Full Refund If you don't receive your order
  • Full or Partial Refund , If the item is not as described Learn More >
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.

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

-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* USB Cable


Post a new topic

Please note that TOMTOP Forums are a community for all communicating and getting help each other. There will be some enthusiastic friends participate in your discussions. Of course TOMTOP customer service (with tomtop customer service icon) response is guaranteed ,which is the same way you contact us at http://www.tomtop.com/contacts

open this forum in full page
Customer Reviews

There are no customer reviews yet.

  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 stars

Share your thoughts with other customers and get Tomtop Points, the first 5 reviews get DOUBLE Tomtop Points!

Write a Customer Review
Be the first to review this item

Top Sellers More>

Please activate your account first. We will resend the activation email to help you complete your registration.

Recently Viewed


TOMTOP use cookies to give you the best shopping experience. If you continue to use our services or create a new account, we will assume that you agree to our  Privacy Policy.

Tell us which product you want to Social Saving

Click the refresh verification code