Excellent product.

Knowing my intended use and minimum requirements, my choices came down to 3 similar products. The PRM-9000 won over the other 2 options because of its additional features.

Cost was not an influence. I did have a limit, but if what I wanted cost too much, I will refuse to settle for less. Fortunately, I could afford this unit. And it's price seemed reasonable compared to the other 2 devices.

Aside from requiring a quality accurate sensitive Geiger counter, I needed a way to know of peaks and when too, without having to sit and watch it all day.

With the PRM-9000, I can set it to alarm over a specified reading, and it keeps the last max detected reading along with a time stamp. It also logs data which you can download and analyze. And you can send decay pulses to an external device for .. well, whatever I suppose, i.e. for additional analysis, processing, recording.

I've only played with this for a day now. I was a little disappointed I found nothing of surprise that was hot around my home, lol. The few known things that I have that are a little hot were packed away in moving boxes (rocks, old glass, etc.). I had to dig something out of a box.

I found a used 1" round dielectric mirror from a laser. I performed a 10 minute reading right over it and got a 7.540 μSv/h reading. Highest thing I've been able to find so far. But, I've not checked everything yet.

My background reading (Twin Cities, MN, south suburbs) averages 0.09 μSv/h during the day. In the night that average drops to 0.07 μSv/h.

I ordered the required data cable to connect it to a PC. I've not done that yet, but I assume it works as others have reported it does.

The only nuisance is battery accessibility. Sure, it says it last a long time, years. But is that still the case if I'm playing with it a lot and using the backlite often, with the LED and sound on? And what about data transfer? I guess time will tell. If I have to remove 4 screws every few months to replace batteries, I'll be a little annoyed.

Otherwise .. I am glad I did my research. No regrets after I've played with this so far. It seems to give really consistent results. And I don't have to babysit it all day to know what happened and when.

5 stars .. but I'll drop that to 4 if I have to change the battery often, lol.

It does its job, and the software is included (built in). But the price makes it lose a star.

If you need the data, it works great.

An excellent and necessary accessory.

This cable makes it all possible to link up to the internet with the right software and become a grassroots member of the Radiation Network. Works very well!