What is the diameter of the extension tubing, I would like to order a longer one?

Tubing is 1/8 inch ID and 1/4 inch OD silicone. Thank you.

Will this device measure levels of Pentane at floor height?

No, this unit measure EX LEL combustibles in the EX LEL or explosiveness and safety purposes. It seems you need something more sensitive, in the PPM range.

Can this detect pure hydrogen?

I've never actually tried mine on pure hydrogen, but it has an LEL sensor which is supposed to detect all combustible gasses. It works by heating a little element on the inside. If the element is exposed to combustible gas, it gets hotter, and that indicates to the machine that combustible gasses are present. Any combustible gas should trigger the sensor. LEL is an abbreviation for Lower Explosive Limit, so any potentially explosive gas should be sensed by the machine. Having said that, I would suggest testing it in the presence of a small amount of hydrogen first, just to be sure. You don't want to risk your life on this if you're not certain.

Can the combustibles reading (% lel) be converted via a correction coefficient to get a reading in ppm for specific chemicals such as toluene or nmp?

Please see Dr. Koz video answer.

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4 Gas Monitor by Forensics | Built-in Pump Multi Gas Meter | O2, CO, H2S, LEL | Color Display & Graphing | USA NIST Calibration | Computer Data Logging |

Product ID: 172286902

Details

Alarm
Vibration
Brand
FORENSICS FD
Color
Black Yellow
Item Weight
0.9 Pounds
Material
ABS
Operating Humidity
85 percent

💾1200 alarm data logs

📊Color display + graphing

⏱️4-gas real-time detection

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C$70956

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Description

🚨 Stay ahead of danger with the smartest 4-gas monitor on the market!

RUGGED READY - Durable ABS casing with anti-slip grip, waterproof, dust-proof, and explosion-proof for any environment.
INTUITIVE VISUALS - Vibrant color display with graphing makes complex data instantly understandable.
ALL IN ONE GAS SAFETY - Simultaneously monitors O2, CO, H2S, and LEL with high-quality UK electrochemical sensors.
DATA DRIVEN DECISIONS - Stores up to 1200 alarm records with computer data logging for comprehensive safety audits.
PRECISION YOU CAN TRUST - USA NIST-calibrated in Los Angeles for unmatched accuracy and reliability.

The Forensics 4 Gas Monitor FD-600-4GAS is a professional-grade multi-gas detector featuring built-in pump and 4-foot probe for precise sampling. It detects Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), and Combustibles (LEL) using UK-made electrochemical sensors. Calibrated to USA NIST standards in Los Angeles, it offers a vibrant color display with graphing, stores 1200 alarm records, and supports computer data logging. Built tough with waterproof, dust-proof, and explosion-proof ABS housing, it’s designed for demanding industrial and safety applications with guaranteed quality and expert support.

Specifications

ASIN	B07WKC4FTV
Alarm	Vibration
Best Sellers Rank	#123,558 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #175 in Multi Testers
Brand	FORENSICS DETECTORS FD
Color	Black, Yellow
Customer Reviews	4.4 out of 5 stars 35 Reviews
Enclosure Material	ABS
Item Dimensions D x W x H	1.2"D x 2.6"W x 5.1"H
Item Weight	0.9 Pounds
Manufacturer	FORENSICS DETECTORS
Mfr Part Number	FD-600-4GAS-UK
Model Number	FD-600-4GAS
Operating Humidity	85 percent
Power Source	Battery Powered
Product Dimensions	1.2"D x 2.6"W x 5.1"H
Product Style	modern
Sensor Type	Electrochemical
Style	modern
UPC	300389770045
Unit Count	1.0 Count

Reviews

M**S

Buy it!

Fantastic tool for spot checking.

5.03.2026

E**A

Good quality analyzer

The analyzer works as intended, and customer support was invaluable and solved my questions promptly. Also assisted with the purchase of the calibration gas and valve. Overall, the meter was a good investment, and I get results within a minute.

8.05.2025

R**A

This is a great tool

Great tool. And the company is very helpful if you have questions. Highly recommend.

26.03.2026

H**Y

Top notch meter and first class support

This is one of the nicest meters I've ever purchased. Seller support is remarkable with knowledgeable replies from a live person on a Sunday afternoon. If you need reliable gas detection and expert level support this is the meter and the company to do business with.

8.01.2023

N**.

Good

Useful and handy

18.01.2026

A**X

Excelente Gast Detector

Best Option value and quality, excelent costumer service. We had bought about 15 units and never got a problem.

8.05.2025

C**N

Un producto muy bueno

Exelente

22.07.2025

K**D

H2S does not register

2, different tested did not register H2S when testing with testing bottle

26.09.2025

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TrustScore 4.5 | 7,300+ reviews

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C$70956

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In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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5 days ago

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1 month ago

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