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GCA-07W Professional Digital Geiger Counter - Radiation Monitor - with External Wand - NRC Certification Ready- 0.001 mR/hr Resolution -- 1000 mR/hr Range
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Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
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Purchase options and add-ons
- HANDHELD PERSONAL NUCLEAR RADIATION DETECTOR. Fast, Accurate and Easy To Use. Detects a broad spectrum nuclear radiation, including low energy background radiation and radiation emitted from Naturally Occuring Radioactive Materials (NORM). Suitable for regulatory inspections. USA Tech Support. Assembled in the USA.
- NRC CERTIFICATION READY – Our NRC certification is available at additional cost from the manufacturer.
- AMERICAN MADE GM TUBE: Detector Sensitivity LND712: Detects Alpha particles above 3 MeV in energy. Beta radiation above 50 KeV; X-Ray and Gamma radiation above 7 KeV.
- COUNTING RESOLUTION AND RANGE: 1 Count Per Minute (CPM) - 10,000 Counts Per Second (CPS).
- RADIATION RESOLUTION AND RANGE: 0.001 mR/hr resolution / 1,000 mR/hr Range (Imperial measurements); 0.01 uSv/hr resolution - 10 mSv/hr range (Metric)
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Product details
- Is Discontinued By Manufacturer : No
- Product Dimensions : 7.5 x 4.1 x 1.2 inches; 1.2 Pounds
- Item model number : GCA-07W
- Date First Available : October 1, 2001
- Manufacturer : Images SI Inc.
- ASIN : B000796XSC
- Best Sellers Rank: #253,033 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #63 in Lab Geiger Counters
- Customer Reviews:
Product Description
The GCA-07W is a handheld personal nuclear radiation detector. A proven track record for detecting nuclear radiation in school physics lab, industrial settings, transport containers, top soil, granite table tops, scrap metal, oil fields, objects and interior spaces.
The external wand makes it easier to search materials and surfaces for radioactivity. The GCA-07W detects Alpha, Beta, X-ray and Gamma radiation above 3 MeV, 50 KeV, and 7 KeV respectively.
Easy to read LCD is a 2 line by 16 characters that provides a current count and radiation level readout. Simple front panel instrument controls make the GCA-07W easy to use. Toggle switches control all the front panel options. User can select a time period, type of measurements (Imperial or Metric). Measurements (counts per second) are converted into radiation levels (mR/hr or mSv/hr). Time selection switch allows Counts Per Second (CPS) or Counts Per Minute (CPM) mode.
Factory calibrated using a NIST traceable source to ensure accurate measurements. Our NRC certification is available at additional cost from the manufacturer. The NRC certification certifies your Geiger counter has passed ANSI-STD N323A calibration using a NIST traceable source from an independent US licensed laboratory conforming to United States Nuclear Regulatory Commission NRC regulations 10-CFR-34 and 10-CFR-35 standards (available at additional costs through the manufacturer).
Options: Jack for Headphones or External Speaker. External Power Supply included. 3.5mm Data Port for WIN PC and microcontroller interface. The WIN PC program requires optional 3.5mm to USB data cable.
Secondary indicators; audio (clicks) and visual (LED) included. 9V battery (mobile operation) not included.
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, ease of use, and accuracy of the geiger counter. They mention that it performs as described, is dependable, and easy to set up. Some are also happy with appearance, radioactivity, and readability. That said, opinions are mixed on quality and value.
AI-generated from the text of customer reviews
Customers like the performance of the biss. For example, they say it's lightweight, performs as described, and has simple operation. Some say it is an excellent and accurate tool for measuring radiation, and it ensures long life and dependable operation. That said, some say it’s a very useful piece of equipment for their research work, and the focus is on quality and functionality, not on bells and whistles.
"This is an excellent and accurate tool for measuring radiation.-..." Read more
"...can get it certified by the NRC standards goes to show its reliability and accuracy. It's easy to operate, the instructions are great...." Read more
"...Works as intended." Read more
"...It worked really well for that." Read more
Customers find the geiger counter easy to use. They mention that it is simple to set up and use right out of the box. The user manual is concise and easy to follow. The snap into position which makes changing the settings intuitive and easy. The information on the company’s website is very informative and everything is clearly labeled.
"...The front panel of the GCA-07W has toggle switch controls. Everything is clearly labeled. I love the toggle switches...." Read more
"This unit is easy enough to use but has on major issue...." Read more
"...It's easy to operate, the instructions are great. It's also fun to use...." Read more
"...documentation and supplemental information on the company’s website are very informative...." Read more
Customers are satisfied with the accuracy of the product. They mention it's accurate and an excellent tool for measuring radiation.
"This is an excellent and accurate tool for measuring radiation.-..." Read more
"...to use, and based on reading several calibration standards is quite accurate...." Read more
"Incredibly accurate, but for the price, you'd expect a good solid construction with high quality materials...." Read more
"I have had this Geiger counter for a while now. It works well and is accurate...." Read more
Customers are satisfied with the appearance of the product. They mention that it is well-designed, nifty, and a great product.
"This is a nifty gadget. It can use a 9V battery for portability. The detachable wand is good for really zeroing in on the sample you want to test...." Read more
"...Love the way it looks and how it feels in hand. Comfortable and simple! Love it." Read more
"This is a nifty gadget." Read more
"Great product, thanks!" Read more
Customers are satisfied with the radioactivity of the product. They mention that it can detect even low levels of radiation, and is sensitive to even low level of radioactivity, such as those found in granite. This is a simple unit that's good for measuring radiation from specific sources.
"This is a simple unit that’s good for measuring radiation from specific sources...." Read more
"...I am glad to know that I can detect even low levels of radiation such as those coming off 19th century objects like radium water jars...." Read more
"...It is sensitive to even low levels of radioactivity, such as what one might find in some granite, or an old piece of uranium glass...." Read more
"Came exactly as advertised, very sensitive to even background radiation. Has a backlight...." Read more
Customers find the readability of the product to be excellent. They mention that the data interface is clear, well-documented, and easy to read. The product is well-made and features simple operation and displays. All features are easily accessible from the switches on the front panel.
"...All features are easily accessible from the switches on the front panel. Data interface is clear and well documented. All very solid." Read more
"...It appears to be very well made and the display is easy to read. I was also surprised and pleased that it came with an external power supply...." Read more
"...Lightweight unit but performs as described, and features simple operation and displays. Nice manual included, with basics of radioactivity." Read more
Customers are mixed about the quality of the GCA-07W Geiger Counter. They mention that it's well-made and easy to use, while others say that it is not well-built, fragile, and not rugged. The connections and jacks are also a bit flimsy, and the case comes apart frequently.
"...It was not my experience. Also, with regard to comments about lack of robust design or non-EMP resistant circuits, I looked in vain for the reviewer..." Read more
"When I received my GCA-07W, I was impressed with the quality of the manufacturing of the product...." Read more
"...The toggle switches on the front of the unit are quite vulnerable to breakage because they protrude out from the unit and could easily damage the..." Read more
"A very nicely built geiger counter which is simple to use, and based on reading several calibration standards is quite accurate...." Read more
Customers have mixed opinions about the value of the product. Some mention that it's a great value for the money, while others say that it is overpriced and has low quality materials.
"...I think it's a great value for the money and the fact that you can get it certified by the NRC standards goes to show its reliability and accuracy...." Read more
"...It works and it’s fun but it’s a lower quality enclosure and probe." Read more
"Very reliable and worth the price. Good documentation ans comes with software for graphing." Read more
"...This unit is easily overpriced." Read more
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- This Geiger Counter was purchased primarily for disaster/catastrophic situations and I was initially disappointed to discover it wouldn't work with Nickel Metal Hydride rechargeable 9 volt batteries, e.g. "Supreme Power" brand. These freshly-charged batteries test at 8 volts when a voltage meter is applied to the contacts without load. I did some research and ordered batteries with a higher voltage. I am pleased to confirm the GCA-07W Professional Geiger Counter works with "Powerex" 9 volt batteries. My VOM (again "no load") reads slightly over 10 volts when applied to freshly charged Powerex batteries. I am glad I waited to paste this eval as l now rate it five stars.
- Incidentally, when I noted this battery problem last month, I sent an email to the company with an inquiry about this issue and, though they didn't have a suggestion, they did get back to me promptly which speaks well of their support efforts. We also discussed a more robust case and switches which they have considered too; it would add significantly to the price, perhaps as much as 50% more!
UPDATE Aug 15, 2018: (This update is written in response to some recent questions and answers that came to my attention.) I store my device in a double Faraday Cage. This makes it substantially more EMP resistant. I also bought an uranium ore sample to test calibration. I will probably have it professionally re-calibrated in 3-5 years to see if it is stable in storage.
UPDATE 04Jan21: Just pulled the unit out to check calibration, batteries, packaging, etc. Still 5 stars. I perused the negative reviews and was surprised by the report of poor customer support. It was not my experience. Also, with regard to comments about lack of robust design or non-EMP resistant circuits, I looked in vain for the reviewer’s alternative product recommendations? Undoubtedly, for $2000-$3000+, a better product, maybe even “mil spec,” could be offered. So in the meantime, I wrap my unit in heavy foil, a heavy plastic bag, and then place it in an cardboard insulated metal garbage can. :)
The wand is made of a thick lightweight plastic. The end of the wand has a metal screen that protects delicate mica window of the GM tube but allows alpha particles to reach the GM tube. It also has a friction fit wand cap that is an additional protection for the wand. The wand cap must be removed for detecting alpha radiation. For the detection of beta, x-rays and gamma radiation you can leave the cap on the wand.
The front panel of the GCA-07W has toggle switch controls. Everything is clearly labeled. I love the toggle switches. The toggle switches snap into position which makes changing the settings intuitive and easy. These switches are so much better than those crappy membrane switches you see on other models. I hate pressing on a membrane switch and hoping the switch press is detected. In any case, that is something you don’t have to worry about with this Geiger counter.
Aside from easy set up, I was even more pleased with its performance.
I must also point out the customer service from the company is excellent. I needed a little help getting started with the Geiger counter. I was transferred to a technical support person who helped me understand how to take background radiation readings. I was also guided to the company’s online nuclear experiments. Now, I don’t remember most of the math I learned in school. But their experiment 1, not only teaches you the right way to measure background radiation. It teaches you, using basic math, how to calculate the Mean (average) and Standard Deviation of the background radiation, what this means and why it’s useful. They have a dozen or so experiments up on the web, I plan to work through them all and report back here what I find.
The next thing I did with my Geiger counter was start testing some old materials I had lying around. I removed the cap and the Geiger counter picked up alpha radiation from some old radium clock faces I have. Then I checked an orange Fiesta ware plate. In both cases these samples caused the Geiger counter to emit a loud clear clicking that easily gets your attention.
I installed the company’s free Geiger graphing software on my computer. I had a compatible USB cable to connect the GCA-07W to my Windows PC computer. I ran a background count for 30 seconds, then I put the wand by the Fiesta ware for 30 seconds. You can see from the picture, on the left side of the screen is normal background. The right side of the screen is the radiation picked up from the Fiesta ware. I have two other Geiger counters and the GCA-07W outperforms them hands down. I would recommend this unit to anyone needing a well-built accurate Geiger Counter.
Reviewed in the United States on July 31, 2019
The wand is made of a thick lightweight plastic. The end of the wand has a metal screen that protects delicate mica window of the GM tube but allows alpha particles to reach the GM tube. It also has a friction fit wand cap that is an additional protection for the wand. The wand cap must be removed for detecting alpha radiation. For the detection of beta, x-rays and gamma radiation you can leave the cap on the wand.
The front panel of the GCA-07W has toggle switch controls. Everything is clearly labeled. I love the toggle switches. The toggle switches snap into position which makes changing the settings intuitive and easy. These switches are so much better than those crappy membrane switches you see on other models. I hate pressing on a membrane switch and hoping the switch press is detected. In any case, that is something you don’t have to worry about with this Geiger counter.
Aside from easy set up, I was even more pleased with its performance.
I must also point out the customer service from the company is excellent. I needed a little help getting started with the Geiger counter. I was transferred to a technical support person who helped me understand how to take background radiation readings. I was also guided to the company’s online nuclear experiments. Now, I don’t remember most of the math I learned in school. But their experiment 1, not only teaches you the right way to measure background radiation. It teaches you, using basic math, how to calculate the Mean (average) and Standard Deviation of the background radiation, what this means and why it’s useful. They have a dozen or so experiments up on the web, I plan to work through them all and report back here what I find.
The next thing I did with my Geiger counter was start testing some old materials I had lying around. I removed the cap and the Geiger counter picked up alpha radiation from some old radium clock faces I have. Then I checked an orange Fiesta ware plate. In both cases these samples caused the Geiger counter to emit a loud clear clicking that easily gets your attention.
I installed the company’s free Geiger graphing software on my computer. I had a compatible USB cable to connect the GCA-07W to my Windows PC computer. I ran a background count for 30 seconds, then I put the wand by the Fiesta ware for 30 seconds. You can see from the picture, on the left side of the screen is normal background. The right side of the screen is the radiation picked up from the Fiesta ware. I have two other Geiger counters and the GCA-07W outperforms them hands down. I would recommend this unit to anyone needing a well-built accurate Geiger Counter.
Reviewed in the United States on November 14, 2022