---
product_id: 722272766
title: "Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched"
brand: "fnirsi"
price: "€ 109.16"
currency: EUR
in_stock: true
reviews_count: 9
category: "Fnirsi"
url: https://www.desertcart.hr/products/722272766-geiger-counter-nuclear-radiation-detector-fnirsi-radiation-dosimeter-with-lcd
store_origin: HR
region: Croatia
---

# Dual numerical & graphical LCD display Rechargeable battery with portable design Detects Gamma, Beta & X-rays Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched

**Brand:** fnirsi
**Price:** € 109.16
**Availability:** ✅ In Stock

## Summary

> ☢️ Stay ahead of invisible threats — monitor radiation like a pro!

## Quick Answers

- **What is this?** Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched by fnirsi
- **How much does it cost?** € 109.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/722272766-geiger-counter-nuclear-radiation-detector-fnirsi-radiation-dosimeter-with-lcd)

## Best For

- fnirsi enthusiasts

## Why This Product

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

## Key Features

- • **Rugged & Portable:** Compact iron body weighing just 7.1 oz, designed for on-the-go professionals in environmental, industrial, and scientific fields.
- • **Smart Multi-Mode Alarm:** Customizable light, vibration, and sound alerts keep you instantly informed of dangerous radiation levels, even in sleep mode.
- • **Versatile Dosage Units:** Switch effortlessly between 5 dosage units to monitor cumulative and real-time radiation exposure tailored to your needs.
- • **User-Friendly Interface:** Intuitive one-handed operation with multilingual support (English/Chinese) and easy system clock & unit settings.
- • **Precision Radiation Detection:** Built-in GM sensor captures Gamma, Beta, and X-ray radiation with ±30% accuracy across 48 KeV-1.5 MeV energy range.

## Overview

The FNIRSI GC-01 Geiger Counter is a high-precision, portable radiation dosimeter designed for professionals and safety-conscious individuals. It detects Gamma, Beta, and X-rays with a built-in GM sensor, offers customizable multi-mode alarms, and displays data on dual LCD screens. Lightweight and rechargeable, it supports multiple dosage units and languages, making it ideal for environmental monitoring, industrial safety, and scientific applications.

## Description

Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched: desertcart.com: Industrial & Scientific

Review: Geiger Counter is Also A Dosimeter - Before I begin, I need to say that this is a Geiger counter that has been designed to be a dosimeter. It measures the accumulated radiation exposure in fractional units of Sieverts over time. This is a high quality dosimeter considering the price. It can read gamma, beta and x-radiation dosages. Two screens are provided: the first is numerical and the second is graphical. The manufacturing quality of this instrument is evident at first glance. It is beautifully packaged in order to protect the Geiger-Mueller tube in shipping which is otherwise subject to shock breakage. I purchased this item in order to monitor radiation dosages in two places in my home. The first is an activated charcoal filter that I have on my water supply in the basement while the second is a reverse osmosis system with charcoal filters under the kitchen sink. Since there is radon in my well water supply, I prefer to remove as much as possible before it is delivered to the faucets in the house. It also serves to reduce the radon levels in air due to cooking, washing, showering and laundry. Capturing the radon in activated charcoal will also capture radon decay products (daughter products). Some of these have very short lifetimes, but some are extremely long and tend to build up in the activated charcoal filters over time. I wanted to see how these radiation dosage levels increased over time in order to determine the optimal time to change the filters. The first thing that I noticed was that in just one week, after a basement filter change, the radiation had already built up by a significant amount. The radon radioactivity in our water is approximately 3000 pCi/L. If allowed to vaporize due to cooking, washing, bathing and laundering, this amount of radiation could add about 0.3 pCi/cubic meter to the air. The radiation dosage level that was measured close to the tank was 1.4 uSv/hr according to the meter. If multiplied by the number of hours in a year, 8760, we arrive at the accumulated dose per year which is 12.3 mSv. This is the amount of radiation exposure that would be possible were a person to stay in proximity to the tank for an entire year. This exceeds the NRC dosage guidelines of 1 mSv (0.1 rem) per year. Clearly, the filter should not be placed anywhere near where people or children would normally gather or play, for example, a finished basement. I will be monitoring the activated charcoal filter tank for several weeks to see if the radiation buildup reaches equilibrium as the filter capacity is exhausted. This will provide a guideline for how often the filter should be replaced. Short term exposure to the filter during a filter change should not be an issue provided that safe handling practices are followed. As a followup, I have decided to change the activated charcoal filter in the basement four times per year since no one is in proximity to the filter most of the time. One additional piece of information: For occasional proximity to radiation by workers, the annual permissible dose is 50 mSv (5 rem) per year. On the subject of radioactivity and dosage; they are not the same, pCi/L cannot be converted to uSv, or vice versa. The first is an instantaneous radiation level in disintegrations per second from a liter of water, while the second is an accumulated exposure dosage over time. Finally, I am not a licensed professional engineer or health physicist. Always consult with a professional engineer or health physicist who is. Most water system installers pose as being knowledgeable, but they are not. While they may attend training courses in radon mitigation, they do not possess the knowledge required to make sound health decisions for your family.
Review: Story Time! - 15 years ago I woked as a Forester in Northern WI. I got the opportunity to work inside the Enterprise Radioactive Forest (google this). A forest that the USFS experimented on with Cesium in the 1970's to help deterime what would happen if the big one ever happened and what the effects of radioactive fallout would be on our forest resources. The project ended decades ago, but the forest continued on. When I worked as a forester, I can say it was the most bizzare forest I ever worked in. The trees all grew weird, were stunted, or misformed. A lot had wires coming out of them from the experiment. I also found alunimum rods everywhere. I picked up one of these rods and used it as a walking stick during the project, and kept it as a momento of working on the project (nothing illegal, it was trash). Years later, I found it in my garage and kind of wondered, is this radio active? Seems logical that it could be. All reserch I did on transfering of radiation to metals like aluminum said it was unlikely, but I was curious so I bought this detector. Glad to find out that it wasn't and I could keep my momento. It actually did not register anything, while bannanas sure did.

## Features

- 【Nuclear Radiation Detector】FNIRSI GC-01 Geiger counter nuclear radiation detector with built-in GM sensor, able to detect Gamma, Beta and X-rays. Cumulative dose equivalent: 0.00 uSv-500.0 mSv. Energy range: 48 KeV-1.5 MeV ≤ plus/minus 30%（for 137 Csγ)
- 【Smart Alarm】3 modes of Light/Vibration/Sound. Geiger counter can set current dose alarm value and cumulative dose alarm value. Whether in sleep or active state, the radiation monitor will alarm if the detected radiation dose exceeds the alarm threshold
- 【Multifunctional Geiger Counter】Our the geiger counter has other various setting, such as alarm setting, system clock setting and unit setting & language change,you can operate in English (default) or Chinese. Easy one-handed operation
- 【Working Principle】FNIRSI GC-01 radiation meter uses a trachea or small room as a probe to detect ionizing radiation gamma/Beta/X-ray. Radiation ionization generates ion pairs, ions are enlarged and converted into electrical pulse counts to measure
- 【Application Areas】Widely applied in the environment where existing ionize radiation. Such as home improvement radiation, geological survey, iron, Inspection vehicles, nuclear power plants, industry, radiology, radiology laboratories and so on

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BHH9X1WG |
| Alarm | Vibration |
| Batteries | 1 Nonstandard Battery batteries required. |
| Best Sellers Rank | #23,348 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Lab Geiger Counters |
| Brand | FNIRSI |
| Color | Yellow |
| Date First Available | October 6, 2022 |
| Item Weight | 7.1 ounces |
| Item model number | GC-01 |
| Manufacturer | FNIRSI-GC-01 |
| Material | Iron |
| Number of Items | 1 |
| Operating Humidity | 95 percent |
| Power Source | Battery Powered |
| Product Dimensions | 1.06"D x 3.07"W x 4.72"H |
| Sensor Type | Photoelectric |
| Style | Compact |

## Product Details

- **Alarm:** Vibration
- **Brand:** FNIRSI
- **Color:** Yellow
- **Item Weight:** 200 Grams
- **Material:** Iron
- **Operating Humidity:** 95 percent
- **Power Source:** Battery Powered
- **Product Dimensions:** 1.06"D x 3.07"W x 4.72"H
- **Sensor Type:** Photoelectric
- **Style:** Compact

## Images

![Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched - Image 1](https://m.media-amazon.com/images/I/613MADyzBsL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: The device won't power on.**
A: 1.Press the power button briefly, avoid long presses. 2.Use the reset button at the device's bottom. 3.Connect to a computer for firmware update.

**Q: Readings are inaccurate.**
A: 1.Ensure the unit is set to μSv/h, the standard for normal areas.  2.Charge the device if the battery voltage is low.  3.Keep away from strong electromagnetic devices during measurement.

**Q: The device fails to detect radiation.**
A: Conduct a function test: hold a test source close to the detector and check if the reading increases. Update the firmware if software freeze causes data lock.

**Q: How do I switch languages?**
A: Long-press the right button to enter settings, navigate to "Language" with the down button, select English, and confirm with the OK button.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Geiger Counter is Also A Dosimeter
*by R***B on April 2, 2025*

Before I begin, I need to say that this is a Geiger counter that has been designed to be a dosimeter. It measures the accumulated radiation exposure in fractional units of Sieverts over time. This is a high quality dosimeter considering the price. It can read gamma, beta and x-radiation dosages. Two screens are provided: the first is numerical and the second is graphical. The manufacturing quality of this instrument is evident at first glance. It is beautifully packaged in order to protect the Geiger-Mueller tube in shipping which is otherwise subject to shock breakage. I purchased this item in order to monitor radiation dosages in two places in my home. The first is an activated charcoal filter that I have on my water supply in the basement while the second is a reverse osmosis system with charcoal filters under the kitchen sink. Since there is radon in my well water supply, I prefer to remove as much as possible before it is delivered to the faucets in the house. It also serves to reduce the radon levels in air due to cooking, washing, showering and laundry. Capturing the radon in activated charcoal will also capture radon decay products (daughter products). Some of these have very short lifetimes, but some are extremely long and tend to build up in the activated charcoal filters over time. I wanted to see how these radiation dosage levels increased over time in order to determine the optimal time to change the filters. The first thing that I noticed was that in just one week, after a basement filter change, the radiation had already built up by a significant amount. The radon radioactivity in our water is approximately 3000 pCi/L. If allowed to vaporize due to cooking, washing, bathing and laundering, this amount of radiation could add about 0.3 pCi/cubic meter to the air. The radiation dosage level that was measured close to the tank was 1.4 uSv/hr according to the meter. If multiplied by the number of hours in a year, 8760, we arrive at the accumulated dose per year which is 12.3 mSv. This is the amount of radiation exposure that would be possible were a person to stay in proximity to the tank for an entire year. This exceeds the NRC dosage guidelines of 1 mSv (0.1 rem) per year. Clearly, the filter should not be placed anywhere near where people or children would normally gather or play, for example, a finished basement. I will be monitoring the activated charcoal filter tank for several weeks to see if the radiation buildup reaches equilibrium as the filter capacity is exhausted. This will provide a guideline for how often the filter should be replaced. Short term exposure to the filter during a filter change should not be an issue provided that safe handling practices are followed. As a followup, I have decided to change the activated charcoal filter in the basement four times per year since no one is in proximity to the filter most of the time. One additional piece of information: For occasional proximity to radiation by workers, the annual permissible dose is 50 mSv (5 rem) per year. On the subject of radioactivity and dosage; they are not the same, pCi/L cannot be converted to uSv, or vice versa. The first is an instantaneous radiation level in disintegrations per second from a liter of water, while the second is an accumulated exposure dosage over time. Finally, I am not a licensed professional engineer or health physicist. Always consult with a professional engineer or health physicist who is. Most water system installers pose as being knowledgeable, but they are not. While they may attend training courses in radon mitigation, they do not possess the knowledge required to make sound health decisions for your family.

### ⭐⭐⭐⭐⭐ Story Time!
*by R***R on November 29, 2025*

15 years ago I woked as a Forester in Northern WI. I got the opportunity to work inside the Enterprise Radioactive Forest (google this). A forest that the USFS experimented on with Cesium in the 1970's to help deterime what would happen if the big one ever happened and what the effects of radioactive fallout would be on our forest resources. The project ended decades ago, but the forest continued on. When I worked as a forester, I can say it was the most bizzare forest I ever worked in. The trees all grew weird, were stunted, or misformed. A lot had wires coming out of them from the experiment. I also found alunimum rods everywhere. I picked up one of these rods and used it as a walking stick during the project, and kept it as a momento of working on the project (nothing illegal, it was trash). Years later, I found it in my garage and kind of wondered, is this radio active? Seems logical that it could be. All reserch I did on transfering of radiation to metals like aluminum said it was unlikely, but I was curious so I bought this detector. Glad to find out that it wasn't and I could keep my momento. It actually did not register anything, while bannanas sure did.

### ⭐⭐⭐⭐ Really cool device!
*by J***F on September 5, 2025*

OK this was one of these items that I really didn't have to have but wanted to get. I was first attracted to the price point for a functional Geiger counter and it has some nice options with it. This counter uses a GM tube I do believe and appears to give me consistent readings when using it with a known radioactive source. It will detect xray, beta and gamma particles and I really like the screen and setting options. Battery life for me has been super good and I like the size and feel in my hands. It is very easy to use but I will say that an area that it could improve in is it's ability to detect and display radiation doses faster and I do wish that it would give the characteristic clicking sound when the GM tube is struck by radioactive particles. So speed of detection and that sound are my only real complaints. I guess both of these are typically available on higher priced units. All in all, I'm very happy with my purchase and it's cool to check out uranium glassware, gas lanterns mantles and smoke detectors. Hope that it works well for a long time to come.

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-03*