Pocket Geiger Counters

Monitor 4

The Monitor 4 detects Alpha, Beta, Gamma, and X-radiations. It also offers 3 operating ranges, a battery check feature, and includes a padded carrying case (right) with belt clip.

A red count light flashes with rising radiation levels, along with an audible click which can be switched off for silent operation (see below right).

Radioactivity also registers on a dual scale analog meter adjustable for 3 operating ranges up to 50 mR/hr or 50,000 CPM (below left).

Play this  sound file to hear the audible clicks of the Monitor 4, recording 3 different tones, depending on which of the 3 operating ranges is set.

In addition to detecting X, Gamma, and Beta radiation, the Monitor 4 is capable of detecting Alpha radiation by virtue of a thin mica window at the end of the Geiger-Mueller tube. It is located strategically at the top of the instrument which, combined with the ergonomic enclosure design, makes aiming the unit at a specific source for Alpha detection that much easier. See photo at left.

This unit also has a Data Output port to record counts on a computer or data logger, as shown in the picture at right. Click on this link for more on the on data output, and the optional  Software  accessories.

The Monitor 4 runs on a single 9 volt alkaline battery (included) which will last up to three months on continuous use at background levels.

Select the navigation button above, or click here for detailed Specifications   on the Monitor 4.

The Monitor 4 is an excellent all-around Pocket Geiger Counter. The switchable operating range is an especially nice feature if you are dealing with low levels of radioactivity - you can set it to the most sensitive operating range so the meter is easier to read, i.e. the needle will "jump" that much farther for the same level of radioactivity.

For the same price, the Monitor 4 is also available in a dual-scale meter that reads in µSv/hr (in lieu of CPM), in addition to mR/hr (see picture).  Readouts in µSv/hr are more popular in Canada and overseas. So please specify below which meter configuration you wish to order.

Purchase the Monitor 4 below, or if you want to build your own  Monitor 4 from a Kit, or consider the specialized  Monitor 4EC model, select the navigation button above or click on these links.

This product typically ships within 24 hours.

 M4 Price: $295

USE COUPON CODE ASUP-14

To purchase the M4 or any other model, click on the link to www.geigercounters.com  and tell them Quartermasters for the Unexplained sent you! Please send us a quick email letting us know that you're interested and going to contact them. We'd like to follow up afterwards and see how it's working for you.

DX-1 Pocket Geiger Counter

The DX-1 Radiation Monitor detects Beta, Gamma, and X-radiations. The counter emits audible clicks from its internal loudspeaker and registers radioactivity on a compressed scale analog meter (see right) up to 10 mR/hr, compacting several ranges into one, available at a glance.

In addition to the audible clicks, at high radiation levels, the speaker beeps, indicating obvious danger. The beeping begins at about 20 mR/hr, with intervals between beeps decreasing in relation to field strength, becoming a continuous tone at 200 mR/hr. Play this  sound file.

The DX-1 includes an easily replaceable, yet long-lasting 9 volt battery. A single pushbutton activates the DX-1 only when needed, as seen in the picture above, and thus conserves battery power. An LED indicator reassures you of battery condition upon each use. The DX-1 is ruggedly constructed and continues to operate in a saturation environment. Select the navigation button above, or click here to see detailed Specifications on the DX-1 Pocket Geiger Counter.

The DX-1 is a very good Pocket Geiger Counter - affordable, simple to use, and all that is needed for a basic determination of whether or not something is radioactive. Purchase the DX-1 below, or if you would like to consider the similar, but higher ranging DX-2  model, select the navigation button above, or click on this link.

DX-1 $249.00

USE COUPON CODE ASUP-14

To purchase the DX-1 or any other model, click on the link to www.geigercounters.com   and tell them Quartermasters for the Unexplained sent you!

[This item is not eligible for price discount, only non-profit sales tax discount.]

Comparison of Pocket/Handheld Models

(Click on the hyperlinked terms in the left column for further explanation)

For a complete listing of pocket models, probe models, software and accessories, click on the link to www.geigercounters.com  and tell them Quartermasters for the Unexplained sent you!