--- product_id: 91493820 title: "FD-4A" brand: "forensics detectors fd" price: "β‚©633191" currency: KRW in_stock: true reviews_count: 9 category: "Forensics Detectors Fd" url: https://www.desertcart.kr/products/91493820-fd-4a store_origin: KR region: South Korea --- # Adjustable multi-mode alarms (audio, visual, vibration) Response time < 30 seconds 4 electrochemical sensors USA NIST calibrated FD-4A **Brand:** forensics detectors fd **Price:** β‚©633191 **Availability:** βœ… In Stock ## Summary > 🚨 Stay Ahead of Danger with Precision & Power! ## Quick Answers - **What is this?** FD-4A by forensics detectors fd - **How much does it cost?** β‚©633191 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/91493820-fd-4a) ## 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 - β€’ **Rugged & Ready:** Durable ABS body with anti-slip grip, waterproof, dust-proof, and explosion-proof for the toughest job sites. - β€’ **Plug & Play Power:** Convenient USB rechargeable battery means no downtimeβ€”just turn on and go, all day long. - β€’ **Instant Safety Alerts:** Customizable audio, visual, and vibration alarms with digital time stamps keep you instantly informed and in control. - β€’ **Certified & Guaranteed:** Comes with a calibration certificate, 1-year warranty, and 100% quality tested in the USA for peace of mind. - β€’ **Precision You Can Trust:** USA NIST traceable calibration ensures industry-leading accuracy across O2, CO, H2S, and LEL gases. ## Overview The USA NIST Calibrated 4 Gas Monitor by Forensics is a professional-grade safety device featuring four high-quality electrochemical sensors for Oxygen, Carbon Monoxide, Hydrogen Sulfide, and Combustibles (LEL). It offers rapid detection with less than 30 seconds response time, customizable multi-mode alarms, and a rugged, waterproof design. USB rechargeable and backed by a 1-year warranty with USA-based quality assurance, this monitor is engineered for reliable, on-the-go gas detection in demanding environments. ## Description USA NIST Calibrated 4 Gas Monitor by Forensics | O2, CO, H2S, LEL | USB Recharge |: desertcart.com: Tools & Home Improvement Review: Customer service came through! - My original review is below. The first unit I received had a bad 02 sensor. Sarah reached out to me and within a few days I received a replacement unit. No issue with the replacement, customer service was willing to help and now everything is all good. Thanks Sarah and all at Forensics Detectors. I am sure that I will be purchasing other equipment in the future. I have no idea if this device is easy to use or not. Value for the money certainly does not seem to be there, and accuracy gets a 0% from me right now. The unit I received went into alarm mode when turned on for the first time and will not reset or clear. Display indicates 02 level at 0.0%, which I have to assume indicates a sensor failure or some issue with the equipment. I have sent emails, but so far I have received NO response at all. I understand that equipment fails sometimes, but with 0 time on the equipment? I am not sure that is an acceptable time between failure. Hopefully this company will reply within the next couple of days and this can be resolved. Update on this issue. Customer Support contacted me and is shipping a new unit to me, I will advise further when new item is received. Review: Good Monitor - Works as intended and included the certificate! ## Features - βš›οΈ SENSOR: High quality electrochemical sensors. USA NIST traceable calibration. Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S) and Combustibles (LEL). Turn ON and GO. - πŸŒ‡ DETECT: Detection error better than ≀±5% F.S. and response time: < 30 sec. Zero and span calibration options. - πŸŽ† ALARMS: Adjustable audio, visual, and vibration alarms alert when preset levels are reached. Alarm digital time stamp. - πŸ’ͺ STRONG: Robust design made of high strength ABS and Anti-slip grip rubber. Waterproof, dust-proof and explosion-proof. - πŸ•΅οΈ TRUST: ** 1 year limited warranty ** Arrives with calibration and QA certificate ** 100% product test and verification in the USA ** 100% quality guaranteed ** ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07J1WQST5 | | Alarm | Audible, Vibration, Visual | | Best Sellers Rank | #85,759 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #67 in Gas Detectors & Alarms | | Brand | FORENSICS DETECTORS FD | | Color | Black, Yellow | | Customer Reviews | 4.4 4.4 out of 5 stars (122) | | Item Dimensions D x W x H | 1.18"D x 2.64"W x 5.12"H | | Item Weight | 0.6 Pounds | | Manufacturer | FORENSICS | | Manufacturer Warranty Description | 1 Year Manufacturer | | Model Number | FD-4A | | Operating Humidity | 95 percent | | Power Source | Battery Powered | | Product Style | Digital | | Sensor Type | Electrochemical | | Unit Count | 1.0 Count | ## Product Details - **Alarm:** Audible, Vibration, Visual - **Battery Life:** 6 Hours - **Brand:** FORENSICS DETECTORS FD - **Color:** Black, Yellow - **Item Weight:** 0.6 Pounds - **Operating Humidity:** 95 percent - **Power Source:** Battery Powered - **Product Dimensions:** 1.18"D x 2.64"W x 5.12"H - **Sensor Type:** Electrochemical - **Style:** Digital ## Images ![FD-4A - Image 1](https://m.media-amazon.com/images/I/615YDnPc4+L.jpg) ## Questions & Answers **Q: Will this device detect ethanol?** A: It will respond to ethanol vapor, but will not be very representative of the actual %LEL since this detector, like all, are calibrated standard to methane. If you need %LEL for ethanol we will need to special order for accurate ethanol %LEL. Thank you. **Q: Does this unit have a belt clip or some other means with which to attach it to an individual?** A: Yes come with an aligator belt clip. **Q: Do you have any device that we can analyze the CO gas from vehicle** A: No unfortunately we do not. Existing products from other companies seem to be OK options. **Q: Conflicting info for battery life. "working battery time > 24 hours" or "average battery life β€Ž6 hours". which is it? thanks!** A: Thanks for bringing it to our attention. Battery life is well over 24 hours! We will fix the Amazon-generated typo. Have a great day. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Customer service came through! *by A***Y on February 1, 2023* My original review is below. The first unit I received had a bad 02 sensor. Sarah reached out to me and within a few days I received a replacement unit. No issue with the replacement, customer service was willing to help and now everything is all good. Thanks Sarah and all at Forensics Detectors. I am sure that I will be purchasing other equipment in the future. I have no idea if this device is easy to use or not. Value for the money certainly does not seem to be there, and accuracy gets a 0% from me right now. The unit I received went into alarm mode when turned on for the first time and will not reset or clear. Display indicates 02 level at 0.0%, which I have to assume indicates a sensor failure or some issue with the equipment. I have sent emails, but so far I have received NO response at all. I understand that equipment fails sometimes, but with 0 time on the equipment? I am not sure that is an acceptable time between failure. Hopefully this company will reply within the next couple of days and this can be resolved. Update on this issue. Customer Support contacted me and is shipping a new unit to me, I will advise further when new item is received. ### ⭐⭐⭐⭐⭐ Good Monitor *by C***L on December 31, 2025* Works as intended and included the certificate! ### ⭐⭐⭐⭐⭐ Great Value *by S***Z on February 7, 2024* This was purchased to replace a broken, very expensive, industrial model. It works just as well and is very accurate, for a fraction of the price....as a matter of fact, this was dropped in water and stopped working. After drying it out, it worked like a charm at the same great level of accuracy. No complaints! ## Frequently Bought Together - USA NIST Calibrated 4 Gas Monitor by Forensics | O2, CO, H2S, LEL | USB Recharge | - FORENSICS DETECTORS FD 4 Gas Monitor + Pump | USA NIST Calibration Certificate | USB Recharge | Sound, Light & Vibration Alarms | - Allegro Industries-9533-25 32" X 13 12" X 14 12" 831 cfm 13 hp 115 VAC 3 A Motor Polyethylene Com-Pax-Ial Blower with Canister and 8" X 25' Duct,Orange --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kr/products/91493820-fd-4a](https://www.desertcart.kr/products/91493820-fd-4a) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-05-10*