---
product_id: 155388986
title: "FD-4A-PUMP"
brand: "forensics detectors fd"
price: "¥90691"
currency: JPY
in_stock: null
reviews_count: 5
url: https://www.desertcart.jp/products/155388986-fd-4a-pump
store_origin: JP
region: Japan
---

# 10-hour lithium-ion battery life Waterproof, dust-proof & explosion-proof robust design Adjustable multi-mode alarms (sound, light, vibration) FD-4A-PUMP

**Brand:** forensics detectors fd
**Price:** ¥90691
**Availability:** ❌ Out of Stock

## Summary

> 🚨 Stay safe, stay ahead—detect danger before it detects you!

## Quick Answers

- **What is this?** FD-4A-PUMP by forensics detectors fd
- **How much does it cost?** ¥90691 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/155388986-fd-4a-pump)

## Best For

- forensics detectors fd enthusiasts

## Why This Product

- Trusted forensics detectors fd brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Quality & Support:** Factory calibrated, 1-year warranty, USA-tested, and lightning-fast engineer support under 6 hours.
- • **Multi-Sensory Alarm System:** Customizable audio, visual, and vibration alerts with digital timestamp logging keep you ahead of danger.
- • **Instant Point Sampling Power:** DC pump with 0.5LPM flow rate and USB recharge—turn on and go, no downtime.
- • **Quad-Gas Precision Detection:** UK-made sensors calibrated to USA NIST standards for O2, CO, H2S, and LEL accuracy.
- • **Built to Endure Extreme Conditions:** Rugged ABS body with anti-slip grip, waterproof and explosion-proof certified for ultimate field reliability.

## Overview

The Basic MULTIGAS + Pump Analyzer by FORENSICS is a professional-grade gas detector featuring UK-made sensors for oxygen, carbon monoxide, hydrogen sulfide, and combustibles. It offers a powerful 0.5LPM pump with USB rechargeable lithium-ion batteries lasting up to 10 hours. Designed for harsh environments, it boasts waterproof, dust-proof, and explosion-proof certification. Multi-mode alarms (sound, light, vibration) with digital logging ensure real-time alerts. Factory calibrated and backed by a 1-year warranty with rapid USA-based customer support, this device is engineered for reliability and peace of mind in confined or toxic spaces.

## Description

Shop Basic MULTIGAS + Pump Analyzer, Detector, Meter by FORENSICS | O2, CO, H2S, LEL | USB Recharge | Sound, Light & Vibration Alarms | Large Display & Backlight |. Free delivery on eligible orders of £20 or more.

Review: Have forensics products for about a year. Ordered the detector and the pump. Had an issue with the charging when I first got it. Would not hold a charge for my 12 hour shift. In and out of building every hour to 2 hours. Turned it off between use in the DAF building of the waste water treatment plant. Called them in California and she instantly shipped me a new meter upgrading me to a better meter. Had it go off several time. We had a propane leak and high HS. I would recommend forensic detector’s. Better than the cheap junk the company bought. You went through AA batteries every shift.
Review: Gives an accurate reading of the levels of four gases. Will alert you to a level of carbon monoxide that is sufficient to make you sick, but insufficient to trigger a standard household alarm.

## Features

- ⚛️ POINT SAMPLING: Perfect for point probe sampling or continuous sampling in confined or toxic spaces. DC Pump flow rate 0.5LPM with USB recharge. Comes FACTORY CALIBRATED. Turn ON and GO.
- 🌇 DETECT: High quality sensors Made in the UK. Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S) and Combustibles (LEL). USA NIST Calibration.
- 🎆 ALARMS: Adjustable audio, visual, and vibration alarms alert when preset levels are reached. Alarm digital time stamp and logging.
- 💪 STRONG: Robust design made of high strength ABS and Anti-slip grip rubber. Waterproof, dust-proof and explosion-proof exceeding Exib IIB T3 Gb.
- 🕵️ TRUST: ** 1 year limited warranty ** Arrives with calibration and QA certificate ** 100% product test and verification in the USA ** 100% quality guaranteed **. USA Customer support with engineer email response rate less than 6 hours.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07J1TTDY3 |
| Average Battery Life | 10 Hours |
| Batteries | 2 Lithium Ion batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Battery Cell Type | Lithium Ion |
| Best Sellers Rank | 729,670 in DIY & Tools ( See Top 100 in DIY & Tools ) 370 in Gas Detectors |
| Colour | Yellow |
| Customer Reviews | 4.4 4.4 out of 5 stars (53) |
| Date First Available | 4 Oct. 2018 |
| Item Weight | 680 g |
| Item model number | FD-4A-PUMP |
| Manufacturer | FORENSICS DETECTORS |
| Part Number | 70-04BB-GH7G |
| Power Source | Battery Powered |
| Product Dimensions | 13 x 6.7 x 3 cm; 680.39 g |
| Style | Basic |
| Wattage | 10 Milliwatts |

## Product Details

- **Alarm:** Audible
- **Brand:** FORENSICS DETECTORS FD
- **Colour:** Yellow
- **Item weight:** 1.5 Pounds
- **Manufacturer:** FORENSICS DETECTORS
- **Operating humidity:** 0-95 percent
- **Power source:** Battery Powered
- **Style:** Basic

## Images

![FD-4A-PUMP - Image 1](https://m.media-amazon.com/images/I/71c7U6vwjgL.jpg)
![FD-4A-PUMP - Image 2](https://m.media-amazon.com/images/I/81uZ0x+wXEL.jpg)
![FD-4A-PUMP - Image 3](https://m.media-amazon.com/images/I/813FhcCN1wL.jpg)
![FD-4A-PUMP - Image 4](https://m.media-amazon.com/images/I/41ruPKapycL.jpg)
![FD-4A-PUMP - Image 5](https://m.media-amazon.com/images/I/71YahYTTQBL.jpg)

## Questions & Answers

**Q: Does this detect levels of h2s outdoors? looking to measure levels of h2s in the air.**
A: Yes, it detects H2S in the air. However, usually, outdoor H2S is much less than 1ppm, so this may not detect H2S. For example, the human nose can detect down to 0.0001ppm H2S.

**Q: Is the gas sensor om this meter replaceable?**
A: Yes they are.

**Q: it says it detects combustibles LEL.  does that mean all combustibles.  natural gas, methane, propane, acetelene, etc.**
A: It checks gases that can mix with air and be explosive at the lower level. It will not tell you the kind or level of gas. Not sure if it will check every gas. Below is further explanation and a list of gases. 

Lower and Upper Explosive Limits for Flammable Gases and Vapors

Before a fire or explosion can occur, three conditions must be met simultaneously.
A fuel (ie. combustible gas) and oxygen (air) must exist in certain proportions, along with an ignition source, such as a spark or flame. The ratio of fuel and oxygen that is required varies with each combustible gas or vapor.
The minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air is defined as the Lower Explosive Limit (LEL) for that gas. Below this level, the mixture is too "lean" to burn. The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit (UEL). Above this level, the mixture is too "rich" to burn. The range between the LEL and UEL is known as the flammable range for that gas or vapor.


Methane - LEL.. 5% by volume in Air / UEL.. 17% by volume in Air

Visual example to show where on the scale % of LEL is measured
Visual example to show where on the scale % of LEL is measured



Lower and Upper Explosive Limits
The values shown in the table below are valid only for the conditions under which they were determined (usually room temperature and atmospheric pressure using a 2 inch tube with spark ignition). The flammability range of most materials expands as temperature, pressure and container diameter increase. All concentrations in percent by volume.

Gas	LEL	UEL
Acetone	2.6	13
Acetylene	2.5	100
Acrylonitrile	3	17
Allene	1.5	11.5
Ammonia	15	28
Benzene	1.3	7.9
1.3 Butadiene	2	12
Butane	1.8	8.4
n Butanol	1.7	12
1 Butene	1.6	10
Cis 2 Butene	1.7	9.7
Trans 2 Butene	1.7	9.7
Butyl Acetate	1.4	8
Carbon Monoxide	12.5	74
Carbonyl Sulfide	12	29
Chlorotrifluoro ethylene	8.4	38.7
Cumene	0.9	6.5
Cyanogen	6.6	32
Cyclohexane	1.3	7.8
Cyclopropane	2.4	10.4
Deuterium	4.9	75
Diborane	0.8	88
Dichlorosilane	4.1	98.8
Diethylbenzene	0.8	 
1.1 Difluoro 1 Chloroethane	9	14.8
1.1 Difluoroethane	5.1	17.1
1.1 Difluoro ethylene	5.5	21.3
Dimethylamine	2.8	14.4
Dimethyl Ether	3.4	27
2.2 Dimethyl propane	1.4	7.5
Ethane	3	12.4
Ethanol	3.3	19
Ethyl Acetate	2.2	11
Ethyl Benzene	1	6.7
Ethyl Chloride	3.8	15.4
Ethylene	2.7	36
Ethylene Oxide	3.6	100
Gasoline	1.2	7.1
Heptane	1.1	6.7
Hexane	1.2	7.4
Hydrogen	4	75
Hydrogen Cyanide	5.6	40
Hydrogen Sulfide	4	44
Isobutane	1.8	8.4
Isobutylene	1.8	9.6
Isopropanol	2.2	 
Methane	5	17
Methanol	6.7	36
Methylac etylene	1.7	11.7
Methyl Bromide	10	15
3 Methyl 1 Butene	1.5	9.1
Methyl Cellosolve	2.5	20
Methyl Chloride	7	17.4
Methyl Ethyl Ketone	1.9	10
Methyl Mercaptan	3.9	21.8
Methyl Vinyl Ether	2.6	39
Monoethy lamine	3.5	14
Monomethy lamine	4.9	20.7
Nickel Carbonyl	2	 
Pentane	1.4	7.8
Picoline	1.4	 
Propane	2.1	9.5
Propylene	2.4	11
Propylene Oxide	2.8	37
Styrene	1.1	 
Tetrafluoro ethylene	4	43
Tetrahydrofuran	2	 
Toluene	1.2	7.1
Trichloro ethylene	12	40
Trimethylamine	2	12
Turpentine	0.7	 
Vinyl Acetate	2.6	 
Vinyl Bromide	9	14
Vinyl Chloride	4	22
Vinyl Fluoride	2.6	21.7
Xylene	1.1	6.6

**Q: Can I put the probe in a furnace exhaust vent**
A: Do not do that please. We have nearly the same product with correct filters and setup to do this. It is our COMBUSTION ANALYZER and actually cheaper than this version, look up ASIN B07QNFZ3X8 and B07Q3TBX1P, Thank you.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***E on 7 February 2026*

Have forensics products for about a year. Ordered the detector and the pump. Had an issue with the charging when I first got it. Would not hold a charge for my 12 hour shift. In and out of building every hour to 2 hours. Turned it off between use in the DAF building of the waste water treatment plant. Called them in California and she instantly shipped me a new meter upgrading me to a better meter. Had it go off several time. We had a propane leak and high HS. I would recommend forensic detector’s. Better than the cheap junk the company bought. You went through AA batteries every shift.

### ⭐⭐⭐⭐⭐ Review
*by M***E on 27 February 2025*

Gives an accurate reading of the levels of four gases. Will alert you to a level of carbon monoxide that is sufficient to make you sick, but insufficient to trigger a standard household alarm.

### ⭐⭐⭐⭐⭐ Review
*by R***N on 29 October 2024*

Nice quality tool arrives with a calibration certificate. I selected this unit as a middle of the road replacement for another unit that had been stolen. I am very satisfied with this unit. Replacement parts and calibration services are local to the LA market which was also a factor in my choosing this unit. And the videos are great!

## Frequently Bought Together

- FORENSICS DETECTORS FD 4 Gas Monitor + Pump | USA NIST Calibration Certificate | USB Recharge | Sound, Light & Vibration Alarms |
- USA NIST Calibrated 4 Gas Monitor by Forensics | O2, CO, H2S, LEL | USB Recharge |
- MOUNTO 12-Inch Heavy Duty Cylinder Axial Fan with 25-Foot Vinyl Hose | High-Performance Portable Blower/Exhaust Fan | 2900 CFM Directional Airflow for Crawl Spaces, Attics, Basements

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-01*