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HAOKESITE PLT840-4
HAOKESITE 4 Gas Monitor Rechargeable Portable Gas Detector H2S O2 CO and LEL Multi Gas Monitor Professional Gas Sniffer with LCD Display Sound Light Vibration Alarm Mode.
Only 8 left in stock - order soon.
A four-gas personal monitor for combustible gas (LEL), hydrogen sulfide, oxygen and carbon monoxide; it does not measure CO2. It alerts with voice prompts, a 120 dB alarm, vibration and light, runs on an 1800 mAh lithium battery and clips onto clothing. Built for confined-space and industrial work, it suits buyers needing gas-leak and oxygen safety rather than ventilation tracking.
- Price
- $102.99
- Brand
- HAOKESITE
Prices from Amazon as of . Product prices and availability are accurate as of the date and time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of the product. As an Amazon Associate I earn from qualifying purchases.
Ranking within Category
Comparing this product to others on Nomad Gear Finder (in the carbon monoxide detectors category with a value specified):
- This product's Length is higher than 93% of 30 others: 5.51 in. (140 mm)
- This product's Width is higher than 70% of 31 others: 2.87 in. (73 mm)
- This product's Depth/Height is lower than 83% of 31 others: 1.26 in. (32 mm)
Specifications
These details are subject to change and may not be current. Please check Amazon or manufacturer web site to confirm before purchase.
- Model
- PLT840-4
- Manufacturer page
- Link
- Popular brand
- No
Physical Attributes
- Weight
- 0.47 lbs
- Weight
- 0.22 kg
- Length
- 5.51 in.
- Length
- 140 mm
- Width
- 2.87 in.
- Width
- 73 mm
- Depth/Height
- 1.26 in.
- Depth/Height
- 32 mm
Features
Details from the HAOKESITE PLT840-4 Amazon listing:
- 【Four Alarm Modes】4 in 1 gas detector can detect EX (0-100% LEL), H2S (PPM), O2 (0-30% VOL), CO (PPM). When the dangerous gas content in the air is too high. Gas monitors will remind you that the place is dangerous within 30S through four methods: human voice, 120 decibel alarm, vibration and light.
- 【LCD Display and Battery】Multi gas monitor has an LCD display that allows you to easily read the screen data, the readings are very reliable, it is an excellent device to ensure the safety of workers when we are undergrounding construction and confining space work. We use 1800mAh high-capacity lithium battery to ensure that the product can be used for a long time.
- 【Advanced Technology】Compared with other products, we use real voice prompts to allow users to quickly understand the product. And we come with a calibration cap, you can use a plastic tube to put the gas in, it can measure gas concentration more accurately. Comes FACTORY CALIBRATED, open and use it directly.
- 【Materials and Design】In terms of equipment material, it is made of high-strength ABS and non-slip grip rubber, small size and unique clip design, which can be clipped on clothes when use it. Good shock resistance, dust-proof, waterproof and explosion-proof functions. When you are in a closed or hypoxic environment, you don't want it to sound the alarm all the time, all four gases can be adjusted to your desired threshold (within the range).
- 【Packaging and Customer Service】Adoption hard metal outer box packaging, it is convenient for you to carry out, and the product can reach your hands in good condition. In addition, we are willing to provide you with unconditional returns and exchanges within 90 days. If you have any questions, please contact us by email, we will try our best to help you solve the problem.
Similar products from other brands
Chosen for their similar specs and price:
 This productHAOKESITE PLT840-4 |
 TOPTES Guard-101 |
 FORENSICS DETECTORS FD FD-4A |
 First Alert CO410 |
|
|---|---|---|---|---|
| Price | $102.99 | $99.99 | $215.45 | $39.95 |
| Model | PLT840-4 | Guard-101 | FD-4A | CO410 |
| Popular brand | No | – | – | – |
| Min. CO detection (ppm) | – | 0 | 0 | – |
| Max. CO detection (ppm) | – | 1,000 | 1,000 | – |
| Resolution (ppm) | – | 1 | 1 | – |
| Gases detected | – | CO, H2S, O2 and LEL (combustible gas) | CO, H2S, O2 and LEL (combustible gas) | – |
| Response time (T90) (s) | – | 60 | 30 | – |
| Accuracy | – | CO ±10% | ±5% F.S. | – |
| Sensor type | – | Electrochemical | Electrochemical | Electrochemical |
| Sensor life (years) | – | 2.0 | 2.0 | – |
| Built-in pump | – | No | No | – |
| Low alarm level (ppm) | – | 50 | – | – |
| High alarm level (ppm) | – | 200 | – | – |
| Alarm loudness (dB) | – | – | – | 85 |
| Adjustable alarm levels | – | Yes | Yes | – |
| Charging time (hours) | – | 8.0 | – | – |
| Battery runtime (hours) | – | 12 | 20 | – |
| Battery capacity (mAh) | – | 2,000 | 2,000 | – |
| Charging port | – | – | Micro-USB | – |
| Battery chemistry | – | Lithium (non-replaceable) | Lithium-ion | – |
| Weight (lbs) | 0.47 | 0.44 | 0.51 | 0.70 |
| Weight (kg) | 0.22 | 0.20 | 0.23 | 0.32 |
| Length (in.) | 5.51 | 5.12 | 5.12 | 5.00 |
| Length (mm) | 140 | 130 | 130 | 127 |
| Width (in.) | 2.87 | 2.56 | 2.64 | 3.40 |
| Width (mm) | 73 | 65 | 67 | 86 |
| Depth/Height (in.) | 1.26 | 1.77 | 1.18 | 1.50 |
| Depth/Height (mm) | 32 | 45 | 30 | 38 |
| Operating temp min (℉) | – | -4 | 0 | – |
| Operating temp max (℉) | – | 122 | 122 | – |
| Operating temp min (℃) | – | -20 | -18 | – |
| Operating temp max (℃) | – | 50 | 50 | – |
| NIST traceable calibration | – | – | Yes | – |
| ATEX / IECEx certified | – | – | Yes | – |
| Certifications summary | – | CE, UKCA, RoHS, FCC, Ex ib IIB T3 Gb mark | ATEX | – |
| Warranty | – | 3 Years | 1 Year | 7 Years |
Data sources
Data for this product compiled from this source:
Specifications last updated Oct 20, 2026.