RADEX RD1503+ with Dosimeter (Outdoor Version): High accuracy geiger counter, nuclear radiation detector

Great device. My son and I were able to measure ambient radiation from sea level to the foothills of Colorado along with 32,000 feet in a commercial airliner. All readings seemed reasonable. We also measured radiation in our house including on granite counter tops with visible kspar. All readings were reasonable. After a while it wouldn't start, but replaced the original batteries and all is well. Update 4feb2023 I've only used the device a few times a year. Still working great. My son has grown a lot and built a mightyohm geiger counter with an SBM-20 Geiger-Muller tube. We picked up a bottle of uranium ore on Amazon and readings from each counter, measuring both ambient and adjacent to the U-ore are nearly the same. Now we're working on a true random number generator based on radioactive decay that can interface with software running on a laptop. How random.

It's only like, .02 off here n there, it takes multiple readings though out the course of 30 ish seconds and compiles them into one reading, making it a lot more accurate than others I have used. It's simple, It's light weight, it's tiny, it's orange so you won't lose it, its... perfect. And for the price point... AWESOME deal. Very decent unit.

I purchased this unit because of the various reviewers that had generally confirmed accuracy of this meter relative to commercial-grade equipment (Ludlum). I'm satisfied with the operation and limited results in use so far: (1) background in suburban/rural area of Florida = 0.1 µSv/hr; (2) thorium "check source" consisting of lantern mantles quickly set off the alarm and pegged the unit at 9.99 µSv/hr (or 999 uRem, depending on which units you are using). FYI: EPA's recommended 1-year exposure limit is 1 mSv (1,000 µSv) or 0.11 uSv/hr, and EPA's lowest 1-year dose linked to increased cancer is 100 mSv (100,000 µSv) or 11.4 µSv/hr. Note that there is a YouTube video that appears to be this unit (orange) exposed to various radioactive sources that shows the digital readout climbing to as high as 999 µSv/hr (and automatically switching units to mSv/hr). This would be great, but it is not this meter (there is a more costly unit from QUARTA that does have this capability). The display on this meter maxes out at 9.99 µSv/hr (= 999 uRem/hr), as indicated in the specifications. Also note that all of the QUARTA rad meters are apparently manufactured in Russia, which may influence your purchasing decision given the current Ukraine situation...

Bought this for my trip to Chernobyl, which I just got back home from recently. Used this Geiger counter a lot there. Visitors to Chernobyl are given their own dosimeters which are worn around the neck their entire visit, so I just used the Geiger counter mode. Very fast reading and easy to use. I have an idea that the battery life is good because I never had to replace any batteries my entire visit and am still getting a good battery charge indicator, for just 2 AAA batteries (the unit will still run on just 1 even). If you're looking at the device's readout, I believe that the sensor is on the unit's left side, just FYI.

How long has it been since you read the “Instructions” brochure for an electronic product that was clear, concise and WELL illustrated...in color?? I probably missed it on the Amazon site and reviews, but this a German (!) product with good USA support. The final technician who checked the device even signed the card. Thank you “R. Tonk, Laborleiter.” I checked accuracy and sensitivity with a chunk of uranium ore and it works well. Incidentally, the strongest readings are obtained on the left side near the view screen. It is allegedly water-resistant and that appears to be so, but I am not testing that claim at this time. The device is about the size of a deck of cards but approx 1.5 times thicker. The readout is by necessity small print but quite legible. I can already hear the negative reviewers, “This will be fried by EMP.” Yes, quite right. That’s why you store it along with some extra batteries in a heavy-duty, one gallon plastic bag in a 10 gallon metal garbage can, even in the lab. This gives you easy access and the possibility of increased years of function. (n.b. In the event that you or the device is reduced to nuclear slag, this claim is void.)

I really like it. This is my second Radex product (also have the RD1212) as I wanted a backup to the one I had in the event a radioactive incident. I've had great results and reliability with my RD 1212 so purchasing another Radex product wasn't a gamble for me. The RD 1503 is similar to my RD1212 as they both read current levels in uS/hr as their main function. The differences are that the 1503 also has the Dosimeter function which I really like. Also, the 1503 has the option to detect for mR/hr which I didn't realize when I purchased it and was a nice surprise. With both devices running at the same time, they only differ in readings by .02+/- .01. I would likely purchase the RD 1503+ if I was only going to have one due to the Dosimeter. By the way, just put your device next to a piece of green uranium glass if you ever want to test it so that you know it detects radiation without buying a radioactive isotope. You can go to any antique store to do this or see if family/friends have a piece.

A wonderful product. I like it for these reasons. Simple to use. Uses two AAA batteries so when SHTF you should be ready unlike some other units with weird batteries that you will never find. I like it!!!!!!!

My cat just came home yesterday from chemo therapy, for a thyroid tumor. I thought i might use this reader and see what his levels are. Here's a video I did to show how to properly use this thing. I believe it's measured is Rem/h(micro Roentgen's per hour)