DX-2 Pocket Geiger Counter
The DX-2 is identical to the DX-1, except for its
readout and for its calibration. Whereas the
analog meter on the DX-1 ranges up to 10 mR/hr, giving way to an additional
audible beep for radioactivity levels beyond that point, the DX-2
goes all the way up to 100 mR/hr or 1,000 µSv/hr with its dual
scale meter.
The DX-2 still provides the audible clicking as in the
DX-1, but lacks the additional audible
beep of the DX-1 in exchange for its higher range meter.
You can see the difference in the analog meters of the two units below:

DX-1
Meter DX-2 Meter
The DX-2 also offers more sophisticated calibration than
the DX-1, including an adjustable oscillator tied to a screw on the back of the
instrument, whereas the DX-1 has only a "fixed" calibration.
In deciding between the DX-1 and DX-2, look at it this way:
If you want to know whether or not something is radioactive, the DX-1 is
generally sufficient, and also offers that additional audible warning beep.
If it is important for you to not only detect radioactivity, but also to
quantify its level, for instance, 15 mR/hr versus 60 mR/hr, then the DX-2 would
be more suitable. Also choose the DX-2 over the DX-1 if you need a
professionally calibrated unit, and one that accommodates periodic
re-calibration.
Also note that among all of our featured Geiger counters,
including both Pocket and Probe style models, the DX-2 is one of the few whose
meter registers up to 100 mR/hr. Most other units have a maximum readout
of 50 mR/hr, in contrast.
This product typically ships within 1 business day.
Specifications (only as they differ from DX-1):