spring clearance


Mouse over to zoom in

SMART SENSOR ST8900 4 in 1 Gas Detector H₂S and CO Monitor

SMART SENSOR ST8900 4 in 1 Gas Detector H₂S and CO Monitor

Industrial Digital Handheld Toxic Gas Carbon Monoxide Detector Carbonic Oxide Hydrogen Sulfide Gas Tester 0-999ppm with LCD Display Sound and Light Vibration Alarm 100-240V

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


  • us plug
  • eu plug
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 >
This professional 4 in 1 gas detector is designed for detecting CO, H₂S, O₂ and LEL gas. It can continuously monitor the CO, H₂S, O₂ and LEL gas concentration in the surrounding environment, once the gas concentration reaches the level of the alarm, the alarm will sound, light and vibrate. High precision portable CO, H₂S, O₂ and LEL gas tester with compact size and light weight, very easy to carry and operate.  

Detect 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide(H₂S), oxygen(O₂) and combustible gas(LEL).
Continuously monitor the CO, H₂S, O₂ and LEL gas concentration in the surrounding environment with professional and accurate measurement.
Sound & light vibration alarm works when one of the CO, H₂S, O₂ & LEL gas concentration reaches the level of the alarm.
Can set automatic shutdown time and concentration of alarm value.
Large color LCD display with backlight for easy reading.
Can connect to a sampling pump to operate in closed place.
Can be widely used in shipping, mining, oil exploitation, chemical, gas pipeline, tunnel construction, coal, metallurgy, paper, fire, municipal, textile and other industries.

Color: Orange
Material: ABS Plastic
Display: Color LCD Backlight Display
Screen Size: 47 * 38mm / 1.9 * 1.5in
Plug: US
Input: 100-240V, 50-60Hz
Sensor: Electrochemical Principle
Duty Cycle: 2 Years
Explosion Proof: √
Protection Grade: IP65
Detection Gas: Carbon Monoxide(CO, Hydrogen Sulfide(H₂S), Oxygen(O₂), Combustible Gas(LEL)
Measurement Range: CO: 0~999ppm, H₂S: 0~500ppm, O₂: 0~30%VOL, LEL: 0~100%LEL
Resolution: CO: 1ppm, H₂S: 1ppm, O₂: 0.1%VOL, LEL: 1%LEL
Accuracy: CO: ±10%, H₂S:±5%, O₂: ±3%FS, LEL: ±5%FS
Alarm: Sound & Light Vibration Alarm (Alarm value can be set)    
Alarm Point: Low Alarm Point CO: 35ppm, H₂S: 10ppm, O₂: 19.5%VOL, LEL: 10%LEL             
                     High Alarm Point CO: 70ppm, H₂S: 20ppm, O₂: 22.5%VOL, LEL: 20%LEL
Alarm Sound: up to 80dB                      
Response Time: Instantaneous
Warm-Up Time: < 20 Seconds      
Continuous Operation Time: 6 hours(slightly vary with working condition)
Power Supply: 1 * Rechargeable BL-9C Lithium-ion 3.7V 2500mAh Battery (Built-in)
Operating Temperature: -10~50℃ / 14~122℉     
Operation Humidity: 15%~95%RH (non condensation)
Product Size: Approx. 140 * 75 * 43mm / 5.5 * 3.0 * 1.7in
Size of the Storage Box: 230 * 205 * 50mm / 9.1 * 8.1 * 2.0in
Product Weight: Approx. 249g / 8.8oz
Package Size: Approx. 25.5 * 21 * 5.5cm / 10.0 * 8.3 * 2.2in
Package Weight: Approx. 753g / 26.6oz

Package List:
1 * 4 in 1 Gas Detector
1 * USB Line
1 * AC Adaptor
1 * Storage Box
1 * Use Manual (English)


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://counselingcenterforwellness.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

veronica film vk | Download ringtone | Die Super Mario Brothers Super Show