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Your cart is empty.The GQ gmc-320-plus digital Geiger counter is the latest GMC-320Plus Fulfill developed by GQ electronics LLC, USA. as an enhanced version of gmc-300e Plus, it has larger internal Flash memory to facilitate data processing capability. It also has temperature sensor & electronic gyroscope, LCD contrast control, front LED indicator, analog data port output, new graphic Type. this product can be used for industrial, commercial or Test equipment, such as universities, laboratories, environment evaluation measurement, hospital research, scientific analytical applications, antique evaluation, building material testing research and so on. comparing to other brand products, the most prominent advantages of this product are: having most features and cost effective. It also has unique features, such as, record data first play it back later; open protocol for easy application integration; visualize real-time graph, data logging. portable and convenient with built-in audible and visual signals, it features automatic data recording. It is able to continually monitor the radiation and log the data each second into internal memory. When connected to a PC, GQ software can download the radiation history data to the computer and the user is able to analyze those data later. The device uses USB port for communication and power. The internal battery can be charged via wall adapter or car adapter. Using the adapters, continuous data monitoring is possible and no worry about batteries charge or any data loss. The main board has a real time clock for time related data logging purposes. the USB port communicates with GQ gmc-320 Plus soft Geiger counter software and GQ Geiger counter data viewer software. For professional data logging, an more advanced version, may be purchased at low cost from gq. .
Christopher Barsamian
Reviewed in the United States on October 19, 2024
Went to Japan on business right after Fukushima incident. Took it with me tested my food to make sure it wasn’t radioactive my hotel room and elsewhere. Worked well.
James McLean
Reviewed in the United States on March 3, 2023
Works great with great battery life. It was unnerving at first because it immediately started to count, but this is normal background radiation. A bargain at this price, worth much more.
Nicolai Mihaleff
Reviewed in Australia on August 22, 2021
This device is accurate and really great on the power usage making battery operation dependable. The device is a really good price & was also delivered AHEAD of stated date.....Amazon service is amazing
Customer
Reviewed in Australia on June 15, 2021
Own this device for a while and tested many times, it works as it should.Battery life is unbelievable, charged once after few months of use.
steve s.
Reviewed in the United States on March 21, 2021
This is a great little geiger counter (nuclear radiation monitor). This does not read EMF...that is another type of monitor. The GMC-320 measures Beta, Gamma, and X-Ray radiation. The GMC-320 does not measure Alpha radiation but the GMC-600/Plus does measure Alpha radiation. The GMC-320 does not have WiFi connectivity but the GMC-320 Plus does have WiFi connectivity. I am checking the GMC-320 with several types of radiation sources such as: rocks, beads and lantern mantles. I'm comparing the readings to an old Radalert (Model 50 or 100). The lantern mantles are quite energetic. There are all kinds of display modes including graphing. The monitor can interface with a computer. The monitor includes rechargeable batteries and can be charged via USB connection. The monitor measures 3 x 5 x 1" and weighs 4.37 ounces. A great little geiger counter!
Carlos S
Reviewed in Mexico on October 31, 2018
Excelente producto. Tengo mi oficina cerca de un gabinete de radiología, pude comprobar que no estoy expuesto a radiación. Lo probé también con un equipo de rayos x dentales, funciona a la perfección. Muy satisfecho.
David François
Reviewed in France on August 14, 2015
Le tarif est correct par rapport à d'autres appareils similaires que j'ai trouvé dans mes recherches.Vu que mon utilisation prévue est quelques mesures dans mon environnement et non un usage professionnel.L'appareil est plutôt bien pensé. Par exemple l'affichage change de sens lorsque l'on retourne l'appareil, comme sur les iphone.Les fonctions vont à l'essentiel. Il y a aussi un rétroéclairage automatique de l'écran.Concernant les logiciels je ne les ai pas encore essayé... peut-être un ajout à cette revue.Ce qui m'à surpris ce sont les accessoires fournis : un cable mini usb de bonne qualité, une prise usb secteur certes étasuniene, une prise allume cigare usb et un étuis en tissu.Ca change d'apple... En même temps, la prise étasuniene n'est pas près de me servir et j'ai déja de nombreux cables usb et aussi des prises usb allume cigare...Et puis l'étuis, j'aurai aimé qu'il protège efficacement l'écran, qui est la partie fragile. Donc aucun des accessoires ne va me servir... Et j'aurai aimé une offre moins chère encore... sans les inutiles accessoires.La boite en carton fait un très bon étuit, sans compter que l'appareil est fourni emballé dans un sachet en une espèce de plastique molletonné.
bani
Reviewed in the United States on July 23, 2015
This is an amazingly feature packed little device, and very well thought out. The screen is large and clear and backlit, and is put to good use. It even has a builtin gyroscope so it can flip the screen if it is held upside down. You can data log with it, and you can even hook it up via USB to your PC. It charges via USB as well, very convenient.The included detector tube inside the unit is an M4011, not the most sensitive and it will not detect alphas. But this is a good choice for a beginner and is inexpensive and pretty durable.The GMC-320+ is reasonably hackable. I just modified mine to accept an LND-7312 which is an exceptionally sensitive alpha/beta/gamma pancake detector. If you have a known calibration source, you can calibrate the device to uSv/h.Highly recommended.
Trajork
Reviewed in the United States on June 12, 2015
This is a very good Geiger counter for the price. I've been using it for some at-home, low-budget experiments with small amounts of radioactive substances, and it has worked extremely well, with very consistent readings both when left in the same spot with background radiation and when it is placed next to a radioactive source (a sealed check source, uranium ore, a 2.33 g piece of depleted uranium metal, a thorium gas mantle, etc). Battery life is excellent.I have also had good luck with the software. The device records the number of counts for every second in its memory, which holds about two weeks of data. The software allowed me to download the data to my computer and convert it to CSV format, which can then be analyzed in Excel to see variations in natural background radiation, to determine if a very slightly radioactive source is measurably more radioactive than background, and the like.The sensitivity is a little low and quite dependent on where an object is placed relative to the narrow Geiger-Mueller tube, which is located at the bottom of the device below the buttons. I have two check sources: a sodium-22 source to check gamma sensitivity and a thallium-204 source for betas. With the beta source, I found that the plastic surrounding the GM tube prevents it from picking up the betas emitted by Tl-204 (maximum energy 764 keV; the advertised minimum for this device is 250 keV). If you open it up and put the source directly against the GM tube, it does gain the ability to detect them, although you shouldn't do this with non-sealed sources because they will contaminate the tube. With the gamma source, a 2-hour average of 6032 cpm was recorded, based on the source being placed directly against the bottom of the unit with the plastic back on. From this, I calculated an efficiency of 0.57%. This is a little low, but it still makes for a very useful device.Finally, the manufacturer runs a helpful forum where you can ask questions and try to solve issues you might have with it, and I hear their customer service is good although I've never used it myself. All in all, I'm very satisfied and the price can't be beat.edit: Got a third sealed check source: manganese-54, which emits only one gamma ray at 835 keV (99.98% of the time) and virtually nothing else. The sensitivity was only about 0.30%. I believe I overestimated Na-22 because it emits both a gamma and a positron (which produces another two gammas) on the vast majority of its decays. But even 0.3% is fine for most purposes and everything else is fantastic, so I'll keep the rating at 5 stars.
Sebastien C
Reviewed in France on March 31, 2015
Je cherchais un compteur Geiger-Müller bon marché, mais permettant néanmoins d''enregistrer les mesures et de les lire avec un PC. Les modèles d''entrée de gamme des autres fabricants que j''ai pu trouver ne le permettent pas.Il y a un petit logiciel de démonstration et une documentation en anglais sur le site internet de GQelectronicsLLC, qui permet de tester virtuellement l''appareil, cela correspond parfaitement avec ce que j''ai reçu.En plus des pilotes pour Windows & Linux, il y a deux programmes téléchargeables pour récupérer les données, cela permet notamment d''envoyer régulièrement les relevés soit sur le site du fabriquant, avec une carte du monde, soit où l''on veut sur le web, avec la version « pro » plus élaborée, non fournie avec l''appareil.Le compteur tient dans une poche, l''autonomie est d''au moins trois jours. Le site internet est très moche (en mars 2015) mais on y trouvera pas mal d'informations et de liens utiles dans la partie forum.L''utilisation est très simple, j''ai pu mesurer un bruit de fond entre 0,05 et 0,15 µS/h dans Paris et proche banlieue... pas de mauvaise surprise pour le moment... bref je recommande vivement !
michaelP
Reviewed in the United States on May 18, 2014
This is a nice little unit, I have had it approximately one month and have had very few issues with it.Pros:Battery life you wish your smartphone had.. I have gotten 3 days of life out of the battery with the power save disabled, speaker on and back light at its lowest setting with some power to spare.Plenty sensitive for background measurements.Logging features seem to work... I have it set for every second and get about a week of stored readings.Several display options, I usually leave it on text mode and primarily pay attention to the CPM and total count readings.Lowest price meter that offered logging capabilities I could find.Cons:The buttons are a bit difficult to push and get the unit to register them, this seemed to get better with use as the buttons seemed to need a "break in".mini-USB connection is a bit too easy to disconnect by mistake (GQ mentions what seems to be a simple fix in their forums but I have not tried it yet)Short timeouts in the menu options mean you have to be ready to push the right button at the right time.The motion detection is a little sensitive and often won't keep the backlight/speaker off when the unit is lying on its back, I'm sure some firmware tweaks could fix.Some readings:Background (Near Raleigh NC) 15-18 CPMBackground while driving through South Central VA 20-45 CPM (varied wildly)Potassium bicarbonate in plastic bag next to the GM tube: 28CPM (11 hr average)"depression glass" ash tray 29CPMLantern Mantels (old type which contain thorium) 1200-1500CPM20CPM = .1uSv/hr (based on looking at the display, I have no idea what source it was calibrated against)
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