ST8900 4 in 1 Gas Detector Oxygen O2 Hydrogen Sulfide H2S Carbon Monoxide CO Combustible Gas Lel Gas Analysis

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About this item

ST8900 4 in 1 Gas Detector Oxygen O2 Hydrogen Sulfide H2S Carbon Monoxide CO Combustible Gas Lel Gas Analysis


This product is a portable handheld instrument that can continuously monitor four different gases: CO, H₂S, O₂, and LEL. When these gases are detected, all concentrations will be displayed on the LCD. The unit also provides user-configurable high and low alarms, as well as STEL/TWA alarm functions. Once the alarm conditions are exceeded, the device has audio and vibrating visual alarms.


1. It can detect 4 kinds of gases: carbon monoxide (CO), hydrogen sulfide (H2S), oxygen (O2) and combustible gas (LEL).

2. The concentration of CO, H₂S, O₂ and LEL gas in the environment can be continuously monitored, and the measurement is professional and accurate.

3. When the concentration of any one of CO, H₂S, O₂ and LEL reaches the alarm level, the sound and light vibration alarm works.

4. Provide automatic shutdown time and concentration alarm value.

5. Equipped with a large color LCD screen with backlight, which is convenient for reading at night and works normally.

6. It can be connected to a sampling pump to operate in a confined place.

7. It is widely used in shipping, mining, petroleum exploration, chemical industry, gas pipeline, tunnel construction, coal, metallurgy, papermaking, fire protection, municipal administration, textile and other industries.


Sensor specifications




Carbon monoxide (CO)



Hydrogen Sulfide (H2S)



Oxygen (O2)



Combustible gas (LEL)



Other specifications



Working current


Working voltage


Battery type (included)

BL-9C rechargeable battery

Operating humidity


Storage temperature


Short circuit current


Maximum open circuit voltage

≤ 4.2V

Display type

Segment LCD

Operating temperature



360 grams

Battery working time

6 hours (no alarm clock)

Detection gas

carbon monoxide (CO, hydrogen sulfide (H2S), oxygen (O2), combustible gas (LEL)


CO: 1ppm, H2S: 1ppm, O2: 0.1% VOL, LEL: 1% LEL

Warm-up time

<20 seconds



Package Included:

1 * Multi-function gas meter

1 * User Manual

1 * Charging adapter

1 * USB data cable

1 * Calibration certificate

(n/a)ST8900 4 in 1 Gas Detector Oxygen O2 Hydrogen Sulfide H2S Carbon Monoxide CO Combustible Gas Lel Gas Analysis
Shipping information

(1) FREE Shipping 10 - 15 business days, (2) Standard Shipping 7 - 12 business days.

Shipping and Delivery Estimates

We ship in-stock orders as soon as possible. This is often within two business days, but there are situations where it may take longer. All estimates are based on business days.


(1) The shipping time mentioned above refers to the estimated time of business days that the shipment will take after an order has been shipped.

(2) Business days do not include Saturday/Sunday and any public holidays.

(3) These estimates are based on normal circumstances and are not a guarantee of delivery times.

(4) We are not responsible for the failures or delays in delivery resulting from any force majeure event, such as natural disaster, bad weather, war, customs issues, and any other event beyond our direct control.

Return and exchanges

Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can't offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

for more information please visit our Refunds & Returns Policy page.