Nomad Gear Finder
FORENSICS DETECTORS FD FD-4X
4 Gas Meter for Confined Space | USA NIST Calibration | O2, CO, H2S, LEL
A four-gas meter that reads CO from 0 to 999 ppm at 1 ppm resolution, plus H2S, O2 and combustible gas, with USA NIST traceable calibration. It has electrochemical sensors, adjustable audio, visual and vibration alarms and a 2000 mAh lithium-ion battery, and it is one of the few meters listed that charges over USB-C. It suits buyers who want calibrated CO readings plus wider gas checks in one handheld.
- Min. CO detection
- 0 ppm
- Max. CO detection
- 999 ppm
- Resolution
- 1 ppm
- Charging time
- 4.0 hours
Rankings in the carbon monoxide detectors Category
How does this product compare with others in Nomad Gear Finder's carbon monoxide detectors category?
- Weight 0.25 kg Higher than 72% of 29 others
- Length 5.10 in. 130 mm Higher than 80% of 30 others
- Depth/Height 1.20 in. 33 mm Lower than 83% of 30 others
Compare this product with close matches Compare with all carbon monoxide detectors
Videos for this product
We searched YouTube for reviews, installation guides, and manufacturer videos for FORENSICS DETECTORS FD FD-4X. Note that many product videos are sponsored by manufacturers, so keep in mind that some reviews may be biased in favor of the product. Negative videos are less likely to get made and posted.
Search YouTube for more FORENSICS DETECTORS FD FD-4X videos
About these videos
Videos may not be an exact match for this product, or may contain inaccurate information. Check product details before purchase, and see our About page for more information.
Videos are from YouTube; videos load from YouTube when you press Play.
Specifications
These details are subject to change and may not be current. Please check Amazon or manufacturer web site to confirm before purchase; see our About page for more information.
Detection capabilities
- Min. CO detection
- 0 ppm
- Max. CO detection
- 999 ppm
- Resolution
- 1 ppm
- Gases detected
- CO, H2S, O2 and LEL (combustible gas)
- Accuracy
- ≤ ±5% F.S.
- Sensor type
- Electrochemical
- Built-in pump
- No
Alarms
- Adjustable alarm levels
- Yes
Charging
- Charging time
- 4.0 hours
- Battery capacity
- 2,000 mAh
- Charging port
- USB-C
Core specs
- Battery chemistry
- Lithium-ion
Physical Attributes
- Weight
- 0.25 kg
- Length
- 5.10 in. 130 mm
- Width
- 2.60 in. 63 mm
- Depth/Height
- 1.20 in. 33 mm
- IP rating
- IP65
Operating Temp Range
- Operating temp min
- 0 ℉ -18 ℃
- Operating temp max
- 122 ℉ 50 ℃
Warranty & Certification
- Warranty
- 1-year limited warranty
- NIST traceable calibration
- Yes
Features
Details from the FORENSICS DETECTORS FD FD-4X Amazon listing:
- 🚀 SENSOR: High-quality nano sensors are included in this 4-gas meter to detect Oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), and combustibles (LEL). Comes FACTORY-CALIBRATED.
- 🌇 DETECTION: Using ultra advanced nano-sensors for high fidelity and resolution. Zero and span calibration options.
- ⚛️ ALARMS: Adjustable audio, visual, and vibration alarms when preset levels are reached.
- 💪 STRONG: Rubber feel with high-strength ABS and anti-slip grip. Water-resistant, dust-proof, and explosion-proof.
- 🕵️ TRUSTWORTHY: ** 1-year limited warranty ** Arrives with calibration and QA certificates ** Product tested and verified in the USA **
Similar products from other brands
Chosen for their similar specs and price:
 This productFORENSICS DETECTORS FD FD-4X |
 TOPTES FD-90A-CO |
 BW Technologies GasAlertMicroClip XL |
 Sensorcon AV8-CO-03 |
|
|---|---|---|---|---|
| Price | $199.00 | $79.99 | $609.99 | $194.00 |
| Model | FD-4X | FD-90A-CO | GasAlertMicroClip XL | AV8-CO-03 |
| Popular brand | Yes | No | Yes | Yes |
| Min. CO detection ppm | 0 | 0 | 0 | 0 |
| Max. CO detection ppm | 999 | 1,000 | 500 | 500 |
| Resolution ppm | 1 | 1 | 1 | 1 |
| Gases detected | CO, H2S, O2 and LEL (combustible gas) | CO | CO, H2S, O2 and LEL (combustible gas) | CO |
| Response time (T90) s | – | 30 | – | 20 |
| Accuracy | ≤ ±5% F.S. | ±5% F.S. | CO ±10% | CO ±10% |
| Sensor type | Electrochemical | Electrochemical | – | Electrochemical |
| Sensor life years | – | 2.0 | 5.0 | – |
| Built-in pump | No | No | No | – |
| Low alarm level ppm | – | 50 | 35 | 35 |
| High alarm level ppm | – | 200 | 200 | 200 |
| Alarm loudness dB | – | – | 95 | – |
| Adjustable alarm levels | Yes | Yes | Yes | Yes |
| TWA / STEL alarms | – | – | Yes | – |
| Charging time hours | 4.0 | 3.0 | 6.0 | – |
| Battery runtime hours | – | 24 | 18 | – |
| Battery capacity mAh | 2,000 | 1,500 | – | – |
| Charging port | USB-C | Micro-USB | – | – |
| Battery chemistry | Lithium-ion | Lithium-ion | Lithium-ion polymer | – |
| Weight lbs | – | 0.31 | 0.42 | 0.25 |
| Weight kg | 0.25 | 0.14 | 0.19 | 0.11 |
| Length in. | 5.10 | 4.30 | 4.40 | 3.20 |
| Length mm | 130 | 109 | 113 | 81 |
| Width in. | 2.60 | 2.30 | 2.40 | 2.20 |
| Width mm | 63 | 58 | 60 | 56 |
| Depth/Height in. | 1.20 | 1.70 | 1.20 | 0.86 |
| Depth/Height mm | 33 | 43 | 32 | 22 |
| IP rating | IP65 | – | IP68 | – |
| Operating temp min ℉ | 0 | 0 | -4 | -4 |
| Operating temp max ℉ | 122 | 122 | 122 | 122 |
| Operating temp min ℃ | -18 | -18 | -20 | -20 |
| Operating temp max ℃ | 50 | 50 | 50 | 50 |
| Warranty | 1-year limited warranty | 1 Year | 2 Years | 2 Years |
| Certifications summary | – | ATEX | CSA Class I Div. 1 Groups A-D, ATEX, IECEx, CE, KTL, INMETRO, FCC Part 15 Class B statement | CE |
| NIST traceable calibration | Yes | Yes | – | – |
| ATEX / IECEx certified | – | Yes | Yes | – |
| Class I Div. 1 (UL/CSA) | – | – | Yes | – |
Data sources
Data for this product compiled from these sources:
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.
Specifications last updated Nov 2, 2026.