---
product_id: 95144854
title: "RangerEXP External 2\" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection"
brand: "radiation alert"
price: "HK$86"
currency: HKD
in_stock: false
reviews_count: 4
url: https://www.desertcart.hk/products/95144854-rangerexp-external-2-geiger-muller-detector-bluetooth-with-free-observer
store_origin: HK
region: Hong Kong
---

# On-board Memory Bluetooth Connectivity Radiation Sensitivity RangerEXP External 2" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection

**Brand:** radiation alert
**Price:** HK$86
**Availability:** ❌ Out of Stock

## Summary

> Stay Ahead of the Curve with RangerEXP! 🚀

## Quick Answers

- **What is this?** RangerEXP External 2" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection by radiation alert
- **How much does it cost?** HK$86 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/95144854-rangerexp-external-2-geiger-muller-detector-bluetooth-with-free-observer)

## Best For

- radiation alert enthusiasts

## Why This Product

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

## Key Features

- • **Smart Alerts:** User-programmable alerts and timers keep you informed.
- • **Flexible Monitoring:** External probe allows for versatile detection in any environment.
- • **Seamless Integration:** Connect effortlessly with the free Observer BLE app.
- • **Unmatched Sensitivity:** Detects alpha, beta, and gamma radiation with precision.
- • **Data at Your Fingertips:** Record and analyze readings with on-board memory.

## Overview

The RangerEXP External 2" Geiger Muller Detector is a cutting-edge device designed for professionals who demand excellence in radiation detection. With its exceptional sensitivity to alpha, beta, and gamma radiation, user-friendly programmable alerts, and Bluetooth connectivity to the free Observer BLE app, this detector is perfect for ensuring safety and compliance in any setting. Its external probe offers flexibility, while on-board memory allows for easy data recording and analysis.

## Description

The Ranger EXP is a high performance, durable, lightweight radiation detector for field use or in your facility. This Radiation detector is designed specifically for individuals operating in tough environments. The small, handheld Geiger counter offers excellent sensitivity to NORM and low levels of alpha, beta, gamma, and x-rays. The digital readout is displayed with a red count light and a beeper sounds with each count detected. Other features include an adjustable timer, selectable alert, and with the free Observer USB Software Family, you can download your collected data, and set alarms!

## Features

- Excellent sensitivity to alpha, beta, and gamma
- On-board memory to record collected readings
- User programmable alerts and timer
- External probe for flexibility
- Free observer usb software
- Now With Bluetooth and Free Observer BLE App

## Product Details

- **Brand:** Radiation Alert
- **Power Source:** Corded Electric
- **Display Type:** LCD

## Images

![RangerEXP External 2" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection - Image 1](https://m.media-amazon.com/images/I/61UMW5QcjwL.jpg)
![RangerEXP External 2" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection - Image 2](https://m.media-amazon.com/images/I/51zZhr30RHL.jpg)
![RangerEXP External 2" Geiger Muller Detector, Bluetooth with Free Observer BLE App, Protective Boot, Excellence in Radiation Detection - Image 3](https://m.media-amazon.com/images/I/51xHEwFBsYL.jpg)

## Questions & Answers

**Q: Does this unit use decimal counts per second, or only whole numbers?**
A: Mine comes on measuring counts per minute in whole rounded figures only. If you push the Mode section, you can change this to counts per second in decimal figures with a decimal point. You can count in either of those modes over a set period of time if you want to by pre-selecting a time period e.g. 10 minutes. Hope this helps some. Sussie.

**Q: external probe included?**
A: Yes. The External Probe as shown is included and for me is the best feature of all. Other models, though cheaper, do not have this probe. Hope this helps.

**Q: Is this the follow-up model of the inspector exp?**
A: Yes,the Ranger is the new unit.

**Q: does this have a mica window on the back? or is the only detector in the probe?**
A: mica window in the probe.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by W***4 on May 12, 2021*

I have an EE background and I'm a physics nerd, but I bought this because I like gadgets; I don't have much of a practical use for it, unless WWIII. On the rare occasion that I go rock hunting, or to a gem show, it will go with me. So my review is more from a consumer standpoint.Operation and functionality are great. It's easy to use, the menus are intuitive. It has a speaker that clicks for each count; the speaker faces the front, and can be covered with tape for attenuation, or temporarily with a finger. Or you can simply disable it with the menu. The backlight has a 7 second timer, or you can set it to Always On - a setting many devices are lacking. The backlight doesn't seem to use much battery power, so I usually leave it on.It seems accurate enough. I have a couple test sources, a Zn55 gamma source and a Po210 alpha. It registers approximate expected counts on both, and it's nice to see that it does a good job of detecting alpha from the Po210. Background count is as expected. You can send this to the manufacturer, located in the US, for NIST calibration. It's only $60, so I might do that.The probe is excellent quality, very solidly built. It is all metal and has a nice cushion grip. The head contains the GM pancake tube, and it has a protective screen over the mica membrane. A simple plastic cap is included to keep stuff out, and it also functions as an alpha filter.The main unit has a plastic body and seems somehwat cheap, but it is functional. I don't like the membrane panel - they tend to wear faster. The battery compartment is the worst, it seems like it was installed as an afterthought. It's difficult to insert and remove batteries, and sometimes feels like it will break when doing so. Good thing the battery life is long.There is no provision for external power, nor a rechargeable battery pack. However, rechargeable batteries do work. The battery indicator simply shows 3 bars when full, instead of 4. I have had it powered on for about 100 hours on rechargeables, and it still shows 3 bars. Wild guess is that I will get about 300 - 500 hours, which is more than fine (specs are 800 hours with alkalines).The included cable is rather stiff, so I replaced it with a 4 foot RG174 50ohm cable. There was no change in readings with the new cable. It is much easier to use, and the extra foot of cable lets you use the probe across the body. It comes with a nice grippy soft rubber case, and also a lightweight vinyl case with a velcro back that allows one-handed use.Even though I don't like the battery compartment, stiff OEM cable, and membrane keypad, I'm still giving 5 stars because overall this is a really nice detector for the price.

### ⭐⭐⭐ Delivered in unidentified packaging
*by G***P on March 27, 2021*

Not sure if this is original. Delivered in unidentified packaging

### ⭐⭐⭐⭐ Nice Device
*by R***I on June 6, 2021*

I started to test radioactive materials with Ranger. This device has wide LCD and the indicated character becomes bigger than before. But black cable is too thick to use and hard. So I bought a thinner cable in Akihabara and used it.

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**Shop now:** [https://www.desertcart.hk/products/95144854-rangerexp-external-2-geiger-muller-detector-bluetooth-with-free-observer](https://www.desertcart.hk/products/95144854-rangerexp-external-2-geiger-muller-detector-bluetooth-with-free-observer)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-23*