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Wanting a Geiger Counter just for fun (we travel west USA with an RV and it seems we pass through many ‘hot’ areas) I bought this because it was about the cheapest option – most used ones had limited ‘range’ or higher price. This kit is great and easy if you have electronics/soldering ability. While I made it, I was also careful to leave some items OFF the circuit board (eg LED, beeper, switch) so as to install the board within a plastic box, with those items 'wired remotely' and fixed through one box side. The audio socket - provided already soldered on the board - fell off through bad solder, but since I needed to relocate this anyway it didn’t bother me. I bought the ‘cheapest’ Geiger Muller tube (STS-5 for $13) for gamma and hard beta only. The kit worked (occasional background events beeps) but I worried whether it was 'really working' when I failed to find anything ’hot’ on a shopping trip (red-glazed 60’s dinnerware, green uranium glass, old luminous aircraft instruments, granite table tops, salt-free salt, even anything at a local rocks and gems shop!). I had to buy a chunk of uraninite sandstone on ebay to confirm it does work OK! It's just a stand-alone fun thing; I will not be 'calibrating it' and connecting it to other equipment llike a computer.Read full review
Verified purchase: Yes | Condition: New
Most of these kits probably work well but I received mine early within a week or two of it's due date. This would seem good but I believe the components already soldered on the board do not work. After testing the I.C and following the test instructions I requested a circuit diagram it was then that I was given a load of test procedures to find what was wrong and asked for High resolution pictures of the board I soldered you cant send these on ebay. Well you would have to send the photo's separately and at that point I just gave up the idea of fixing this obviously cheaper project. I have constructed much more complicated kits from scratch including another Geiger counter with no trouble. I was just unlucky with this one.
Verified purchase: Yes | Condition: New
I recommend this inexpensive Geiger counter board and components. I bought it together with a Geiger tube (also bought on eBay). It would have been nice if they offered a complete kit including the tube. It would also be nice if they offered a kit with a plastic housing. For my project I ripped out the guts of an old TV remote control and put this board inside. This involved a small modification to add wire to enable the LED to be placed elsewhere. The PDF assembly instruction manual provided is incredibly good. I am not an electronics expert so I appreciated the level of detail (especially the detail about how to understand the markings on the capacitors). For the resistors, I just used a digital multimeter to sort them (the standard stripes are such a pain to read). I'm fairly experienced in electronics soldering, but I found some of the holes in the circuit board were extremely close together (I'd say about 0.5mm or less between them). For those close connections, I had some trouble soldering some of those pairs of pins without having them connected by a solder blob (solder, verify, remove solder, repeat). I used a 40x magnifier to carefully verify that all of the solder connections were well made. Just be careful with the soldering and it should be fine. Also, the piezo buzzer was not clearly marked for polarity as it was stated it would be in the instructions (it had marks near both of the terminals, not one as stated). However, I tested it in isolation (Googled how to do this) and it seemed to work regardless of which way it was connected. So I just picked a direction at random and soldered it. And it works (lots of ticking sound when near a radiation source. Note that I also purchased a small quantity of graded uranium ore to test it with (from Amazon, each rock sold individually and graded individually to state its calibrated radiation level). This is how I know it works. Also, my wife bought later a piece of antique glassware made with Uranium (they call it "Vaseline glass" and it glows under ultraviolet light). Since I now had this Geiger counter, I was able to test that glassware with it (and it emits quite a low level of radiation). Anyway, good product. Verified to work. And really, its so very cool to be able to say that I have a Geiger counter. :-)Read full review
Verified purchase: Yes | Condition: New
The package contained clear instructions, which were easy to follow even for a beginner like me. I've been using this with my Soviet STS-5 (SBM-20) and Mullard MX 115 tubes for couple of months and it works very nicely. Compared to older models, I really like the way they put effort into improving the circuit to make the device to be more stable and safer to use. The AUX connector is awesome, because it gives you possibility to use your apple or android device as a geiger counter screen to indicate the measurement results. Totally 5/5!
Verified purchase: Yes | Condition: New
Bought this assembled to save time. Arrived quicker than I expected. Well constructed. I've used this with an SBM20, an LND 7317, and an LND 712 (this last one with an additional 4.7 mega ohm resistor on the anode, since 10Mohm total anode resistor is recommended for this one). I even had all three tubes connected at the same time with the voltage adjustment jumper removed, so running at 500V. The SBM handled the higher voltage fine, and all 3 tubes were detecting my check sources well. Also connected it to my Arduino, which picked up the interrupt signal no problem. I short: functions as expected!
Verified purchase: Yes | Condition: New
